1 

UNITED STATES DISTRICT COURT

FOR THE DISTRICT OF COLUMBIA

__________________________________ 

 )

YEDA RESEARCH AND ) 

DEVELOPMENT CO., LTD., ) 

) 

 Plaintiff, ) 

 ) 

 v. ) Civil Action No. 10-1836 (RMC) 

 ) 

ABBOTT GMBH & CO. KG, ) UNDER SEAL 

 ) 

 Defendant. ) 

_________________________________ )

OPINION

The parties in this patent case dispute which was the first to purify and isolate a 

protein called TBP-II. Working independently in two different countries, Yeda and Abbott filed 

patent applications just nine days apart in 1989. Twenty-four years later, litigation continues 

over which has priority to the United States patent for the protein, with each party having won 

and lost battles along the way. Abbott was granted the U.S. patent in 2000. However, Yeda 

succeeded in invalidating Abbott’s patent in administrative proceedings before the United States 

Patent and Trademark Office in 2000. Another judge of this Court vacated that ruling, found for 

Abbott, and sent the case back to the Patent and Trademark Office. Abbott prevailed on remand 

in 2010, and the case returned to this Court with Yeda as plaintiff. The parties recently finished 

discovery. 

As a final precursor to briefing on summary judgment, scheduled for this summer, 

Abbott has asked the Court to compel Yeda to produce materials that, according to Abbott, Yeda 

should have turned over in discovery. Abbott’s request can be broken generally into two 

categories: (1) documents related to 2003 experiments, attended by Yeda representatives, that 
2 

Abbott conducted to replicate the 1989 experiments that led to Abbott’s original German patent 

application, and (2) the royalty agreement that Dr. Engelmann (one of Yeda’s inventors and 

Yeda’s testifying expert) has with other Yeda inventors. The former category presents 

potentially complex legal issues implicating Dr. Engelmann’s multiple roles over the long 

history of this case; the latter category is a much simpler debate. The Court heard oral argument 

on June 5, 2013, and, for the reasons set forth below, Abbott’s motion to compel will be granted 

as to its request for documents related to the 2003 experiments and denied as to its effort to 

obtain the royalty agreement. 

I. BACKGROUND 

The facts of this case and its procedural history are set forth in detail in prior 

opinions of this Court and the United States Court of Appeals for the Federal Circuit. See Abbott 

GmbH & Co., KG v. Yeda Research & Dev. Co. (“Abbott I”), Civ. No. 00-1720 (RMU), Memo. 

Op. (D.D.C. filed June 13, 2005) (denying Yeda’s motion for summary judgment); Abbott GmbH 

& Co., KG v. Yeda Research & Dev. Co. (“Abbott II”), 516 F. Supp. 2d 1 (D.D.C. 2007) 

(construing U.S. Patent 5,344,915 (“915 Patent,” sometimes referred to as the “LeMaire 

patent”)); Abbott GmbH & Co., KG v. Yeda Research & Dev. Co. (“Abbott III”), 576 F. Supp. 2d 

44 (D.D.C. 2008) (granting Abbott’s motion for summary judgment); Abbott GmbH & Co., KG 

v. Yeda Research & Dev. Co. (“Abbott IV”), 333 F. App’x 524 (Fed. Cir. 2009) (dismissing 

Yeda’s appeal for lack of jurisdiction); Abbott GmbH & Co., KG v. Yeda Research & Dev. Co., 

415 F. App’x 257 (Fed. Cir. 2011) (dismissing Yeda’s second appeal for lack of jurisdiction). 

The background of the case is repeated here only as necessary to resolve Abbott’s motion to 

compel. 

4 

Hyatt v. Boone, 146 F.3d 1348, 1351 (Fed. Cir. 1998) (quoting version of 35 U.S.C. § 102(g) 

prior to 2011 amendment; other citations omitted). 

The parties,3 working independently, submitted their first patent applications for 

TBP-II in foreign countries just nine days apart. Abbott filed application P39 15 072 on May 9, 

1989 (“072 Application”) in Germany, while Yeda filed application No. 90,339 (“339 

Application”) on May 18, 1989, in Israel.4 Compl. ¶¶ 8, 12. Abbott filed an additional 

application in Germany, P39 22 089 (“089 Application”) on July 15, 1989. On May 4, 1990, 

Abbott filed an International Patent Application, “claiming the benefit of the filing date of [the 

072 Application];” the International Patent Application was eventually designated as a U.S. 

Patent Application, and the United States Patent and Trademark Office (“USPTO”) issued U.S. 

Patent No. 5,344,915 (“915 Patent”) to Abbott on September 6, 1994. Id. ¶¶ 8–10; see also Yeda 

1st. Opp., Ex. C [Dkt. 54-4] (915 Patent). 

Claiming the benefit of the 339 Application, Yeda filed U.S. Patent Application 

No. 07/930,443 (“443 Application”) on August 19, 1992. Compl. ¶ 12; see also Yeda 1st Opp., 

Ex. D [Dkt. 54-5] (443 Application). On October 1, 1996, the Board of Patent Appeals and 

Interferences (“the Board”) declared Interference No. 103,625 (“625 Interference”) between 

Abbott’s 915 Patent and Yeda’s 443 Application. Compl. ¶ 14; see also Yeda 1st Opp., Ex. A 

[Dkt. 54-2] (Declaration of 625 Interference). “An interference is an administrative proceeding 

designed to determine, inter alia, which party was the first to invent a claimed invention and is 

 

3

 Technically, the patent applications discussed here were filed by groups of scientists and 

companies owned the rights in the patents. At the time the patent applications were filed, 

predecessor companies owned the rights in the patent applications. Because none of these facts 

is in dispute, for the sake of efficiency, the Court will refer to the patent applications and patents 

as having been filed by or granted to “Yeda” or “Abbott.” 

4

 Yeda’s predecessor in interest filed two additional applications in Israel (91229 on August 6, 

1989 and 94039 on April 6, 1990). 
5 

therefore entitled to a patent.” Abbott Mem. Supp. Mot. Compel (“Abbott Mem.”) [Dkt. 57] at 

1. In the 625 Interference, “Yeda asserted that Abbott is not entitled to the benefit of the filing 

dates of either the 072 or 089 [A]pplications, because neither . . . described or enabled a protein 

satisfying each limitation of the Count,” which is the Board’s definition of the “interfering 

subject matter at issue.” Yeda 1st Opp. at 2–3. 

In the 625 Interference, Yeda prevailed. The Board invalidated Abbott’s 915 

Patent and found that Abbott was not entitled to priority based on the 072 and 089 Applications 

under 35 U.S.C. § 112. See Abbott III, 576 F. Supp. 2d at 47. The Board reasoned that the 072 

and 089 Applications did not, “as originally filed,” sufficiently describe the TBP-II protein. Id.; 

see also Yeda 1st Opp., Ex. G [Dkt. 54-8] (First 625 Interference Decision) at 19. Abbott sought 

review of the Board’s decision in this Court under 35 U.S.C. § 146, in case Civil No. 00-1720.5

 

The first district court case was assigned to the Honorable Ricardo Urbina, who 

has since retired. In 2005, Judge Urbina denied Yeda’s motion for summary judgment, rejecting 

its argument that Abbott’s 072 and 089 Applications did not adequately describe the 915 Patent 

as a matter of law. 6 See Abbott I at *7. Two years later, Judge Urbina issued an opinion 

 

5

 35 U.S.C. § 146 provides, in relevant part, that “[a]ny party to an interference dissatisfied with 

the decision of the [Board] on the interference, may have remedy by civil action. . . . Such suit 

may be instituted against the party in interest as shown by the records of the [USPTO] at the time 

of the decision complained of, but any party in interest may become a party to the action. 

. . . Judgment of the court in favor of the right of an applicant to a patent shall authorize the 

Director to issue such patent on the filing in the [USPTO] of a certified copy of the judgment and 

on compliance with the requirements of law.” “District court review of an interference 

proceeding under Section 146 is an equitable remedy of long standing,” and a Section 146 action 

is “an authorized phase of the interference proceeding” before the USPTO. Abbott GMBH & 

Co., KG v. Centocor Ortho Biotech, Inc., 870 F. Supp. 2d 206, 212–13 (D. Mass. 2012) (quoting 

Gen. Instrument Corp. v. Scientific–Atlanta, Inc., 995 F.2d 209, 214 (Fed. Cir. 1993) & VasCath, Inc. v. Curators of the Univ. of Mo., 473 F.3d 1376, 1382 (Fed. Cir. 2007)). 

6

 Yeda takes the position that in the first case, “the sufficiency of the 072 [A]pplication was not 

at issue” because “the 089 [A]pplication disclosed more complete and correct N-terminal aminoacid sequence information than the 072 [A]pplication, and Abbott obtained that information only 
6 

construing the 915 Patent, adopting Abbott’s proposed construction, and concluding that the 

“[915] Patent covers only the TBP-II protein,” not its “naturally occurring muteins.” See Abbott 

II, 516 F. Supp. 2d at 6. Then, finding the evidence underlying the Board’s decision in the 625 

Interference “wholly unsupportive,” Judge Urbina found that the Board committed clear error in 

invalidating the 915 Patent. See Abbott III, 576 F. Supp. 2d at 51. Judge Urbina thus granted 

summary judgment to Abbott and remanded the case to the Board for further proceedings. See

Order, Civ. No. 00-1720 (RMU) (D.D.C. Sept. 15, 2008) (ECF no. 117). Yeda appealed to the 

Federal Circuit, which dismissed the appeal. See Abbott IV, 333 F. App’x at 525 (“Since the 

district court remanded the case for the Board to determine priority, the case is not final; the 

issue of patentability can be reviewed on appeal from a final judgment resolving all issues.”). 

On remand, the Board found on December 3, 2009 that Abbott was entitled to the 

priority of the 089 Application. Compl. ¶ 20. On May 26, 2010, the Board granted judgment in 

the 625 Interference to Abbott, rejecting Yeda’s efforts to modify the claims at issue in the 

Count. Id. ¶ 20; see also Second 625 Interference Decision, Abbott Mem., Ex. B [Dkt. 57]. On 

September 8, 2010, Yeda filed its Complaint in the Northern District of Illinois seeking review 

of the second decision of the Board in the 625 Interference; the Northern District of Illinois 

granted Abbott’s motion to transfer the case back to this District, where it was docketed as Civil 

No. 10-1836, before Judge Urbina. While discovery was under way, the case was reassigned to 

this Court. In this case, Yeda asserts that “the Board reversibly erred because the 072 

[A]pplication failed to provide a written description under 35 U.S.C. § 112, ¶ 1 of a purified and 

 

by using materials and methods that that [sic] it did not use in connection with the 072 

[A]pplication.” Yeda 1st Opp. at 5. 
7 

isolated protein that satisfied all the limitations recited in and required by the Count.”7 Yeda’s 

Resp. Abbott’s Mem. (“Yeda 2d Opp.”) [Dkt. 64] at 4. Yeda contends that the Board erred in 

concluding that the 072 Application “described ‘the same proteins described in [the] 915 

[P]atent’” because the “‘same proteins’ test cannot be reconciled with controlling Federal Circuit 

law, which requires that, to benefit from an application for filing-date purposes, the application 

must provide a written description of each and every limitation required by the Count.”8 Id. 

Yeda also asserts that the 072 Application “did not enable one of ordinary skill in the art, without 

undue experimentation, to purify, isolate, or identify a protein satisfying all of the limitations 

recited in and required by the Count, and it also did not disclose the Abbott applicants’ best 

mode.” Id. at 5. 

Discovery has now closed and the Court has entered a briefing schedule for crossmotions for summary judgment. See Minute Order dated May 28, 2013. Reply briefs are due on 

September 13, 2013. Id. Prior to the close of discovery, during a telephone conference on May 

2, 2013, Abbott advised the Court that the parties had been unable to resolve a dispute about 

whether Yeda was required to produce to Abbott two categories of documents: (1) “documents 

written or reviewed by [Yeda’s] testifying expert relating to certain experiments conducted in 

 

7

 “The specification shall contain a written description of the invention, and of the manner and 

process of making and using it, in such full, clear, concise, and exact terms as to enable any 

person skilled in the art to which it pertains, or with which it is most nearly connected, to make 

and use the same, and shall set forth the best mode contemplated by the inventor of carrying out 

his invention.” 35 U.S.C. § 112, ¶ 1 (as effective through Sept. 15, 2012). 

8 See In re Wallach, 378 F.3d 1330, 1334–35 (Fed. Cir. 2004) (“Whether Appellants were in 

possession of the protein says nothing about whether they were in possession of the protein’s 

amino acid sequence. . . . Until Appellants obtained the complete amino acid sequence of TBPII, they had no more than a wish to know the identity of the DNA encoding it.”); see also

Goeddel v. Sugano, 617 F.3d 1350, 1356–57 (Fed. Cir. 2010) (reversing Board determination in 

interference proceeding that foreign patent application for protein satisfied 35 U.S.C. § 112, ¶ 1 

because the application insufficiently described the process for producing the subject matter of 

the patent). 
8 

this case;” and (2) “documents relating to the financial benefit that the same testifying expert 

stands to gain if Yeda prevails.” Abbott Mem. at 1. The Court directed the parties to file briefs 

addressing Abbott’s motion to compel and held oral argument on June 5, 2013; the matter is now 

fully briefed and ripe for decision. 

B. Facts Relevant to Instant Disputes 

The parties’ discovery disputes concern Dr. Hartmut Engelmann, one of the 

inventors named in Yeda’s patent applications. Dr. Engelmann is a cytokine biologist who 

worked as a post-doctoral fellow at the Weizmann Institute of Sciences in Rehovot, Israel. Yeda 

1st Opp., Att. [Dkt. 54-18] (Engelmann Decl.) ¶¶ 5–6. Dr. Engelmann was part of a group of 

scientists that generated several patent applications and patents, including the applications for the 

TBT-II protein. Id. Yeda is the entity that “commercializes inventions of the Weizmann 

Institute.” Yeda 1st Opp., Ex. N [Dkt. 58-4] (Engelmann Jan. 16, 2012 Dep.) at 13–14. 

1. The 2003 Abbott Experiments 

In 2003, Abbott conducted a set of experiments to reenact its original 1989 

experiments. The facts of the 2003 experiments are mostly undisputed. Abbott states that it 

performed the experiments “as part of a parallel European proceeding involving the same patent 

claims,”

9

 Abbott Mem. at 3, although Yeda argues that “Yeda’s U.S. counsel reasonably 

anticipated that Abbott might rely on those experiments” in the original case in this court and 

Abbott later did so, Yeda 2d Opp. at 5. 

There were two stages to the 2003 experiments. The first took place in 

Ludwigshafen, Germany, and the second took place in Abbott Park, Illinois. During the 

 

9

 Beyond acknowledging at oral argument that the European patent proceedings essentially 

involved the same priority dispute as the United States proceedings, neither party has been more 

specific about the nature of the European proceedings. 
9 

experiments, “Abbott repeated the protocol set forth in the 072 Application” in order “to 

demonstrate that the protocol in the 072 Application enabled a skilled artisan to isolate, purify[,] 

and identify the same TBP-II protein claimed in the 915 Patent.” Abbott Mem. at 3 (citation 

omitted). Abbott “invited Yeda to designate two witnesses to observe the Abbott scientists.” Id. 

Yeda retained Dr. Engelmann “as a non-testifying expert consultant” to observe the first phase in 

Germany and retained Dr. Menachem Rubinstein (another of the Yeda inventors) to observe the 

second phase in the United States. Engelmann Decl. ¶¶ 7, 10. According to Dr. Engelmann, 

Yeda asked him “to observe the experiments in Germany, record [his] observations and prepare a 

report summarizing [his] observations and opinions on the results.” Id. ¶ 11. 

During the first stage, in Germany on February 2–11, 2003, one of Abbott’s 

scientists, Andreas Striebinger, performed the protocol in the 072 Application.10 Engelmann 

Decl. ¶ 8; Abbott Mot., Ex. I [Dkt. 54-10] (Decl. of Dr. Ralph A. Bradshaw) ¶¶ 39–40. Also 

present were: Dr. Ralph Bradshaw, who has been designated as Abbott’s testifying expert in this 

case; Dr. Heinz Hillen, one of the Abbott inventors named on the 915 Patent; and Dr. 

Engelmann, Yeda’s representative. Bradshaw Decl. ¶ 40; accord Engelmann Decl. ¶ 8. The first 

phase yielded two fractions of “essentially homogenous protein,” which Abbott then sent to 

Abbott Park “for an analysis of the N-terminal amino acid sequence using automated Edman 

sequencing techniques.” Bradshaw Decl. ¶¶ 41, 43. In lay terms, in Germany, Abbott attempted 

to isolate the TBT-II protein; in the United States, it sought to determine the composition of that 

protein. During the first stage, Dr. Engelmann took “handwritten notes,” although he “[does not] 

 

10 Specifically, Abbott repeated Example 2 of the 072 Application, which is also Example 2 of 

the 089 Application and the 915 Patent. Bradshaw Decl. ¶¶ 38–39; Engelmann Decl. ¶ 7. 

Example 2 “describes the isolation of protein from urine collected from patients with a fever in 

excess of 38 degrees °C.” Bradshaw Decl. ¶ 38. Yeda contests Abbott’s description of the tests, 

but that disagreement is immaterial to the discovery dispute. 
10 

remember what happened to them.” Abbott Mem., Ex. B [Dkt. 60] (Jan. 16, 2012 Engelmann 

Dep.) at 73. 

The second stage of the experiment took place on March 3–5, 2003, in Abbott 

Park, Illinois. Abbott scientist Dr. Thomas Holzman and his assistant, Sally Dorwin, performed 

the Edman degradation. Bradshaw Decl. ¶ 44. Also present for the second phase were Dr. 

Bradshaw for Abbott and Dr. Rubenstein for Yeda. Id.; accord Engelmann Decl. ¶ 10. The 

parties, predictably, characterize the results of the two phases differently. See Yeda 2d Opp. at 

5–6 (arguing, inter alia, that the first phase “did not result in purification or isolation” and that 

the identification of amino-acid sequences in the second phase took place outside of the presence 

of Yeda representatives). 

Dr. Rubenstein prepared a report for Yeda’s counsel that included the data from 

the second stage of the 2003 experiment. Engelmann Decl. ¶¶ 11–12. In preparing his report for 

Yeda in 2003, Dr. Engelmann reviewed Dr. Rubenstein’s report of the second stage of the 

experiment, and Dr. Engelmann acknowledged having a document “somewhere” containing his 

own re-analysis of the data reported by Dr. Rubenstein. Id.; Jan. 16, 2012 Engelmann Dep. at 

202–03 (“I did an analysis. Prof Rubenstein’s report contained the data, so I could look at the 

data and re-analyze it.”). Dr. Engelmann testified that his final 2003 report was “[s]ome seven or 

eight pages maybe,” and he acknowledged reviewing the report prior to being deposed in this 

case. Jan. 16, 2012 Engelmann Dep. at 74. Dr. Engelmann also stated that he “may . . . have 

made” a declaration for the European proceedings about the 2003 experiment, but he was not 

sure. Id. at 74–75. 

In “2004 or 2005,” “after the observations of [the Abbott 2003] experiments,” a 

group from the Weizmann Institute—including Dr. Engelmann—attempted to reproduce the 


13 

remain confidential, unless that foreign law is contrary to the public policy of [the] forum.” 

Astra, 208 F.R.D. at 98 (citations and internal quotation marks omitted, alterations in original). 

B. Discovery Generally 

Parties are permitted to obtain discovery “regarding any nonprivileged matter that 

is relevant to any party’s claim or defense,” and, “[f]or good cause, the court may order 

discovery of any matter relevant to the subject matter involved in the action.” Fed. R. Civ. P. 

26(b)(1). Discovery can be limited by court order if (1) “the discovery sought is unreasonably 

cumulative or duplicative, or can be obtained from some other source that is more convenient, 

less burdensome, or less expensive,” (2) “the party seeking discovery has had ample opportunity 

to obtain the information by discovery in the action,” or (3) “the burden or expense of the 

proposed discovery outweighs its likely benefit.” Fed. R. Civ. P. 26(b)(2)(C). 

C. Required Disclosures for Testifying Experts—Rule 26(a)(2)(B) 

Pursuant to Fed. R. Civ. P. 26(a)(2)(B), when an expert witness is “retained or 

specially employed to provide expert testimony in the case,” the expert witness must prepare a 

report for disclosure to the adverse party that includes, inter alia, “a complete statement of all 

opinions the witness will express and the basis and reasons for them” and “the facts or data 

considered by the witness in forming them.” The phrase “facts or data” is a change from the pre2010 rule, which referred to “data or other information.” See Fed. R. Civ. P. 26 advisory 

committee’s note to 2010 amendments (“2010 Ad. Comm. note”) (stating that the 2010 

amendment is intended to “limit the expert report to facts or data (rather than ‘data or other 

information,’ as in the current rule) considered by the witness”). The Advisory Committee 

clarified the intent of the change: 

The refocus of disclosure on ‘facts or data’ is meant to limit 

disclosure to material of a factual nature by excluding theories or 

mental impressions of counsel. At the same time, the intention is 
14 

that ‘facts or data’ be interpreted broadly to require disclosure of 

any material considered by the expert, from whatever source, that 

contains factual ingredients. The disclosure obligation extends to 

any facts or data ‘considered’ by the expert in forming the opinions 

to be expressed, not only those relied upon by the expert. 

2010 Ad. Comm. note (emphasis added); see also Allstate Ins. Co. v. Electrolux Home Prods., 

Inc., 840 F. Supp. 2d 1072, 1077–78 (N.D. Ill. 2012) (observing that Rule 26(a)(2)(B) “was 

amended in 2010 to . . . [make] clear that disclosure of theories or mental impressions of counsel 

is not required”); Fialkowski v. Perry, Civ. No. 11-5139, 2012 WL 2527020, at *4 (E.D. Pa. June 

29, 2012) (“[T]he purpose of amending Rule 26 in 2010 was to limit disclosure to materials of a 

factual nature and to protect against disclosure of counsel’s work product.”). 

As discussed in additional detail below, the 2010 amendment to Rule 26(a)(2)(B) 

was accompanied by several other changes to the expert discovery rules governing privilege. 

The 2010 amendment was, in essence, an effort to reign in courts that had held that the 

disclosure requirement of Rule 26(a)(2)(B) trumped all claims of privilege, such as Regional 

Airport Authority of Louisville v. LFG, LLC, 460 F.3d 697, 717 (6th Cir. 2006) (adopting the 

“overwhelming majority” approach that “Rule 26 creates a bright-line rule mandating disclosure 

of all documents, including attorney opinion work product, given to testifying experts.”). The 

bright-line rule is no longer valid; attorneys’ “theories or mental impressions” are protected, but 

everything else is fair game. See Fialkowski, 2012 WL 2527020, at *3 (“[R]equired disclosures 

under Rule 26(a)(2)(B) [after the 2010 amendment] still include ‘any information furnished to a 

testifying expert that such an expert generates, reviews, reflects upon, reads, and or uses in 

connection with the formulation of his opinions . . . .’” (quoting Synthes Spine Co., L.P. v. 

Walden, 232 F.R.D. 460, 463 (E.D. Pa. 2005)); accord Sara Lee Corp. v. Kraft Foods, Inc., 273 

F.R.D. 416, 419 (N.D. Ill. 2011) (discussing intent of 2010 amendment). 
15 

Because the word “considered” is unchanged, cases interpreting its meaning 

remain valid. “For Rule 26 purposes, a testifying expert has ‘considered’ data or information if 

the expert has read or reviewed the privileged materials before or in connection with formulating 

his or her opinion.” In re Commercial Money Ctr., Inc., Equip. Lease Litig., 248 F.R.D. 532, 

537 (N.D. Ohio 2008) (internal citation and quotation marks omitted). “Courts have declined to 

adopt a definition that would necessitate an inquiry into the ‘subjective mental processes’ of the 

testifying expert,” and “[m]aterials reviewed or generated by an expert must be disclosed, 

regardless of whether the expert actually relies on the material as a basis for his or her opinions.” 

Id. (internal citations, quotation marks, and modifications omitted). “Thus, experts have been 

deemed to have considered materials even when they have testified, under oath, that they did not 

consider the materials in forming their opinions.” Id. 

D. Work Product Doctrine 

The work product doctrine has been developed by courts, including extensively in 

the D.C. Circuit, and is also codified in part in the Federal Rules of Civil Procedure. Both 

standards are set forth here. 

1. D.C. Circuit Case Law 

“The party who seeks work product doctrine protection is responsible for 

establishing applicability of the protection and that there has not been a waiver.” United States 

ex rel. Westrick v. Second Chance Body Armor, Inc., 288 F.R.D. 222, 225 (D.D.C. 2012) (citing 

U.S. Airline Pilots Ass’n v. Pension Benefit Guar. Corp., 274 F.R.D. 28, 31 (D.D.C. 2011)). The 

work product privilege “applies to material ‘obtained or prepared by an adversary’s counsel’ in 

the course of his legal duties, provided that the work was done ‘with an eye toward litigation.’” 

In re Sealed Case, 676 F.2d 793, 809 (D.C. Cir. 1982) (quoting Hickman v. Taylor, 329 U.S. 

495, 511 (1947)). “Work product protection is not absolute but rather is a qualified immunity.” 
16 

Westrick, 288 F.R.D. at 226; see also United States v. Nobles, 422 U.S. 225, 239 (1975) (“Like 

other qualified privileges, [the work-product privilege] may be waived.”). “In reviewing 

documents claimed to be protected by the work-product privilege, the court must determine 

‘whether, in light of the nature of the document or the factual situation in a particular case, the 

document can fairly be said to have been prepared or obtained because of the prospect of 

litigation.’” F.T.C. v. Boehringer Ingelheim Pharms., Inc., 286 F.R.D. 101, 107 (D.D.C. 2012) 

(quoting Banks v. Office of Senate Sergeant–At–Arms, 228 F.R.D. 24, 26 (D.D.C. 2005)); see 

also United States v. Deloitte LLP, 610 F.3d 129, 137 (D.C. Cir. 2010) (applying the same 

standard). 

Under Hickman, work product is subject to two different levels of protection: “To 

the extent that work product contains relevant, nonprivileged facts, the Hickman doctrine merely 

shifts the standard presumption in favor of discovery and requires the party seeking discovery to 

show ‘adequate reasons’ why the work product should be subject to discovery. However, to the 

extent that work product reveals the opinions, judgments, and thought processes of counsel, it 

receives some higher level of protection, and a party seeking discovery must show extraordinary 

justification.” In re Sealed Case, 676 F.2d at 809–10. In Boehringer Ingelheim 

Pharmaceuticals, another judge of this Court recently summarized the two standards as follows: 

If a party can show that the documents were developed because of 

ongoing litigation, they are not discoverable absent the requesting 

party’s showing that their need for the documents is substantial and 

that they are unable to obtain the substantial equivalent of the 

materials by other means without suffering “undue hardship.” 

Dir., Office of Thrift Supervision v. Vinson & Elkins, LLP, 124 

F.3d 1304, 1307 (D.C. Cir. 1997). Even when the requesting party 

can meet this burden, only “factual” work product will be 

disclosed; “opinion” work product, which reveals the mental 

processes or impressions of an attorney or his or her agents, will 

still receive the utmost protection. Upjohn Co. v. United States, 

449 U.S. 383, 400 (1981); Dir., Office of Thrift Supervision, 124 
17 

F.3d at 1307 (“Opinion work product . . . is virtually 

undiscoverable.”). 

286 F.R.D. at 107–08; see also United States v. Clemens, 793 F. Supp. 2d 236, 244 (D.D.C. 

2011) (same). “The ‘difficult matter’ of deciding what ‘degree of selection is necessary to 

transform facts into opinions’ has yet to be resolved by the District of Columbia Circuit.” 

Clemens, 793 F. Supp. 2d at 245 (citing Dir., Office of Thrift Supervision, 124 F.3d at 1308). 

2. Federal Rules of Civil Procedure 

“Ordinarily, a party may not discover documents and tangible things that are 

prepared in anticipation of litigation or for trial by or for another party or its representative 

(including the other party’s . . . consultant . . . ).” Fed. R. Civ. P. 26(b)(3)(A). A party can 

overcome the general rule protecting work product when the requested materials are (1) 

“otherwise discoverable under Rule 26(b)(1)” and (2) “the party shows that it has substantial 

need for the materials to prepare its case and cannot, without undue hardship, obtain their 

substantial equivalent by other means.” Id. The Advisory Committee anticipated that the 

substantial need/undue hardship showing would only be met in the “rare case.” 2010 Ad. 

Comm. note. In evaluating whether there is a substantial need, courts have considered factors 

including: “(1) [the] importance of the materials to the party seeking them for case preparation; 

(2) the difficulty the party will have obtaining them by other means; and (3) the likelihood that 

the party, even if he obtains the information by independent means, will not have the substantial 

equivalent of the documents he seeks.” MeadWestvaco Corp. v. Rexam PLC, No. 

1:10cv511(GBL/TRJ), 2011 WL 2938456, at *4 (E.D. Va. July 18, 2011). 
18 

The Federal Rules now contain express protection for communications between 

attorneys and testifying expert witnesses, subject to three exceptions.11 Drafts of testifying 

expert reports are protected from disclosure under Rule 26(b)(4)(B), and Rule 26(b)(4)(C) now 

makes clear that Rule 26(b)(3) (governing work product generally) also protects 

“communications between the party’s attorney and any witness required to provide a report 

under Rule 26(a)(2)(B) . . . except to the extent that the communications: (i) relate to 

compensation for the expert’s study or testimony; (ii) identify facts or data that the party’s 

attorney provided and that the expert considered in forming the opinions to be expressed; or (iii) 

identify assumptions that the party’s attorney provided and that the expert relied on in forming 

the opinions to be expressed.” 

Rule 26(b)(4)(C) was added in 2010 “to provide work-product protection for 

attorney-expert communications regardless of the form of the communications, whether oral, 

written, electronic, or otherwise” and “to protect counsel’s work product and ensure that lawyers 

may interact with retained experts without fear of exposing those communications to searching 

discovery.” 2010 Ad. Comm. note. “The protection is limited to communications between an 

expert witness required to provide a report under Rule 26(a)(2)(B) and the attorney for the party 

on whose behalf the witness will be testifying. . . . The rule does not exclude protection under 

other doctrines, such as privilege or independent development of the work-product doctrine” Id. 

However, the Advisory Committee added that the addition of Rule 26(b)(4)(C) does “not impede 

discovery about the opinions to be offered by the expert or the development, foundation, or basis 

of those opinions.” Id. It further stated: 

 

11 As discussed above, the 2010 Amendments respond to the post-1993 view, adopted by many 

courts, that Rule 26 “authorize[s] discovery of all communications between counsel and expert 

witnesses and all draft reports.” 2010 Ad. Comm. note. In practice, though, “routine discovery 

into attorney-expert communications and draft reports . . . had undesirable effects.” Id.
19 

For example, the expert’s testing of material involved in litigation, 

and notes of any such testing, would not be exempted from 

discovery by this rule. Similarly, inquiry about communications 

the expert had with anyone other than the party’s counsel about the 

opinions expressed is unaffected by the rule. Counsel are also free 

to question expert witnesses about alternative analyses, testing 

methods, or approaches to the issues on which they are testifying, 

whether or not the expert considered them in forming the opinions 

expressed. 

Id. (emphasis added). 

E. Non-testifying Expert (i.e., Consultant) Protection 

Non-testifying experts receive protection under two parts of amended Rule 26. 

First, there is the general statement in Rule 26(b)(3)(A) that “[o]rdinarily, a party may not 

discover documents and tangible things that are prepared in anticipation of litigation or for trial 

by or for another party or its representative (including the other party’s . . . consultant . . . ).” 

Fed. R. Civ. P. 26(b)(3)(A). As stated above, this general rule is subject to an exception in cases 

where the proponent shows “substantial need” and when the requested materials or their 

“substantial equivalent” cannot be obtained “without undue hardship.” Id. 

Rule 26(b)(4)(D) (former Rule 26(b)(4)(B)12) expressly addresses the case of nontestifying experts and sets an “even higher barrier” for discovery of their work product. Sara 

Lee, 273 F.R.D. at 419. Rule 26(b)(4)(D) states: “Ordinarily, a party may not, by interrogatories 

or deposition, discover facts known or opinions held by an expert who has been retained or 

specially employed by another party in anticipation of litigation or to prepare for trial and who is 

not expected to be called as a witness at trial.” As relevant here, discovery of such facts or 

opinions is appropriate “on showing exceptional circumstances under which it is impracticable 

 

12 The 2010 amendments to Rule 26 did not modify present Rule 26(b)(4)(D) in any substantive 

way. See 8A Charles Alan Wright & Arthur R. Miller, Federal Practice & Procedure § 2032 

(3d ed. & Supp.). 
20 

for the party to obtain facts or opinions on the same subject by other means.” Fed. R. Civ. P. 

26(b)(4)(D)(ii). There are “four commonly stated policy considerations” for this rule: “(1) the 

interest in allowing counsel to obtain the expert advice they need in order [to] properly evaluate 

and present their clients’ positions without fear . . . ; (2) the view that each side should prepare its 

own case at its own expense; (3) the concern that it would be unfair to the expert to compel its 

testimony and also the concern that experts might become unwilling to serve as consultants if 

they suspected their testimony would be compelled; and (4) the risk of prejudice to the party who 

retained the expert as a result of the mere fact of retention.” Westrick, 288 F.R.D. at 227–28 

(quoting Long Term Capital Holdings, L.P. v. United States, No. 01–CV–1290 (JBA), 2003 WL 

21269586, at *2 (D. Conn. May 6, 2003)). 

When invoking the “exceptional circumstances” exception to discover a nontestifying expert’s work product, “the burden on the moving party is to show [exceptional] 

circumstances such that it cannot get any facts or opinions on the subject in which it is 

interested.” 8A Charles Alan Wright & Arthur R. Miller, Federal Practice & Procedure

(“FPP”) § 2032 (3d ed. & Supp.). The “exceptional circumstances” burden is high. See Lowery 

v. Circuit City Stores, Inc., 158 F.3d 742, 765 (4th Cir. 1998) (affirming finding that exceptional 

circumstances were not shown when proponent of discovery was “able to obtain sufficient 

information by other means,” the consulting expert from whom discovery was sought “submitted 

a detailed expert report,” the proponent had its own experts that were able to challenge the 

consulting expert’s analysis, and the proponent was able to “thoroughly examine” the consulting 

expert during his deposition), judgment vacated on other grounds, 527 U.S. 1031 (1999); see 

also Doe v. District of Columbia, 231 F.R.D. 27, 41 (D.D.C. 2005) (no exceptional 

circumstances existed when proponent had “other means” to obtain discovery because proponent 
21 

had access to consulting expert’s report and underlying materials and could depose expert). 

However, the burden is not so high as to be insurmountable, and “cases allowing discovery often 

involve information about since-destroyed materials or situations in which the expert might also 

be viewed as a fact witness regarding matters at issue.” FPP § 2032; see, e.g., Braun v. Lorillard 

Inc., 84 F.3d 230, 236 (7th Cir. 1996) (affirming grant of motion to compel because the 

defendant “could not conduct its own tests on tissues that had been destroyed in the course of the 

plaintiff’s tests” and “[t]he only way the defense could find out whether there were crocidolite 

asbestos fibers in the tissues that the plaintiff’s experts had tested was to get the test results”). 

Courts have also found that “[e]xceptional circumstances ‘may exist when a non-testifying 

expert’s report is used by a testifying expert as the basis for an expert opinion, or where there is 

evidence of substantial collaborative work between a testifying expert and a non-testifying 

expert.’” Westrick, 288 F.R.D. at 228 (quoting Long Term Capital Holdings, 2003 WL 

21269586, at *2). 

F. Dual-Hat Experts 

This case presents the issue of “whether, and to what extent, the work-product 

privilege applies when an expert alternately dons and doffs the ‘privileged hat’ of a litigation 

consultant and the ‘non-privileged hat’ of the testifying witness. In other words, does a litigant 

forfeit the privilege that would otherwise attach to a litigation consultant’s work when he offers 

that expert as a testifying witness?” SEC v. Reyes, No. C06-04435 CRB, 2007 WL 963422, at *1 

(N.D. Cal. Mar. 30, 2007); Monsanto Co. v. Aventis Cropscience, N.V., 214 F.R.D. 545, 546 

(E.D. Mo. 2002) (“[T]he overwhelming majority of courts have taken the language of Rule 26 to 

mean that providing otherwise protected materials to a testifying expert who considers them in 

forming an expert opinion generally waives the protection, whether the expert actually relies on 
22 

the information or not.”). The Reyes court summarized the approach of courts prior to the 2010 

amendments to Rule 26 as follows: 

Every court to address this “multiple hats” problem has concluded 

that an expert’s proponent still may assert a privilege over such 

materials, but only over those materials generated or considered 

uniquely in the expert’s role as consultant. B.C.F. Oil Refining, 

Inc. v. Consol. Edison Co. of New York, 171 F.R.D. 57, 61–62 

(S.D.N.Y. 1997); Grace A. Detwiler Trust v. Offenbecher, 124 

F.R.D. 545, 546 (S.D.N.Y. 1989); Beverage Mktg. Corp. v. Ogilvy 

& Mather Direct Response, Inc., 563 F. Supp. 1013, 1015 

(S.D.N.Y. 1983); see also Messier v. Southbury Training Sch., No. 

3:94–CV–1706, 1998 WL 422858, at *1–2 (D. Conn. June 29, 

1988) (unpublished opinion). 

These courts have further concluded that the scope of the privilege 

must be narrowly construed against the expert’s proponent, lest the 

privilege interfere with the goal of the disclosure requirements, 

which is to allow an adversary “to expose whatever weaknesses, 

unreliabilities, or biases might infect the opinions of testifying 

experts called by [an] adverse party.” [United States v.] City of 

Torrance, 163 F.R.D. 590, 593 (C.D. Cal. 1995). Thus, 

“documents having no relation to the expert’s role as [a witness] 

need not be produced but . . . any ambiguity as to the role played 

by the expert when reviewing or generating documents should be 

resolved in favor of the party seeking discovery.” B.C.F. Oil 

Refining, Inc., 171 F.R.D. at 62; see also Offenbecher, 124 F.R.D. 

at 546 (noting that documents “would become discoverable” to the 

extent that “the delineation between [the expert’s] roles . . . 

become[s] blurred”); Beverage Marketing, 563 F. Supp. at 1014 

(noting that the privileged and non-privileged status of 

“consultant” and “witness” materials can be maintained only “if 

this delineation [is] clearly made”). 

Reyes, 2007 WL 963422, at *1–2. In dual-hat expert cases, the term “considered” in Rule 

26(a)(2)(B) should be construed expansively in favor of the party seeking discovery, and “the 

courts should order disclosure when there is at least an ambiguity as to whether the materials 

informed the expert’s opinion. In most instances, if the subject matter directly relates to the 

opinion in the expert report, there will be at least an ambiguity as to whether the materials 

informed the expert’s opinion.” Monsanto, 214 F.R.D. at 547. 
23 

Because the 2010 amendments were intended (as relevant here) to limit discovery 

only with regards to certain types of attorney work product, the same approach remains valid 

after the amendments. That is, courts should apply the “broader discovery for testifying experts 

. . . to everything except ‘materials generated or considered uniquely in the expert’s role as 

consultant,” being sure to avoid compelling production of any of the materials now expressly 

protected by Rule 26. See Sara Lee, 273 F.R.D. at 419–20 (quoting Reyes, 2007 WL 963422, at 

*2). At least one court has applied the exact same standards set forth in Reyes to a dual-hat 

expert after the 2010 amendments. See Sara Lee, 273 F.R.D. at 419–20. 

G. Dual-Hat Expert Cases Cited by the Parties 

In their briefs, the parties discuss the applicability of five dual-hat expert cases: In 

re Commercial Money Center, Inc. Equipment Lease Litigation, 248 F.R.D. 532 (N.D. Ohio 

2008); Monsanto Co. v. Aventis Cropscience, 214 F.R.D. 545 (E.D. Mo. 2002); Fialkowski v. 

Perry, Civ. No. 11-5139, 2012 WL 2527020 (E.D. Pa. June 29, 2012); Employees Committed for 

Justice v. Eastman Kodak Co., 251 F.R.D. 101, 105 (W.D.N.Y. 2008); and Sara Lee Corp. v. 

Kraft Foods, Inc., 273 F.R.D. 416, 419 (N.D. Ill. 2011). These cases provide a useful illustration 

of how courts apply the dual-hat expert rules and are summarized here. 

In Commercial Money Center, a district court applied the dual-hat test to 

documents requested from a financial consultant who had audited business records and was later 

named as a testifying expert, quoting extensively from Reyes and other similar cases. 248 F.R.D. 

at 538–42. The court ordered production of the requested documents. Central to its decision was 

the failure of the party opposing production to demonstrate that the documents “were reviewed 

or generated [by the dual-hat expert] uniquely in his role as consultant” or that the documents 

had “no relation to the subject matter of [the expert’s] report.” Id. at 539. 
24 

In Monsanto, the consultant and testifying expert were two separate people. At 

issue in Monsanto was the size of a gene that Monsanto added to its genetically modified corn 

product, Mon810 corn. 214 F.R.D at 545–46. A consultant for the defendant, Aventis, tested the 

genes in Mon810, and Monsanto argued that Aventis’s testifying expert had considered the 

results of the consultant’s tests prior to preparing his expert report. Id. The court found that 

Aventis had waived work product immunity because “[t]he subject matter of [the expert’s] 

testimony is the characteristics of Mon810 corn in light of the patents-in-suit” and the 

consultant’s test “treat[s] the issue of whether or not Mon810 infringed Aventis’s patents.” Id. at 

548; see also id. at 549 (noting that the test “focus[ed] on the exact scientific findings that are 

central to the legal arguments the parties have advanced”). Noting the expansive definition of 

“considered” in Rule 26(a)(2)(B), and given the direct relevance of the consultant’s test results to 

the expert’s report, the Monsanto court rejected the argument that Aventis’s expert did not 

“consider” the consultant’s report. Id. at 547–58. 

Fialkowski is not a dual expert case per se, although its thoughtful analysis of the 

effect of the 2010 amendments to Rule 26 is useful. The case involved a breach of contract 

claim among former partners of a law firm, and the court ordered production of spreadsheets and 

document analyses the plaintiff had prepared to assist her attorney in understanding the law 

firm’s financial records. Id. at *4–5. The plaintiff’s expert openly acknowledged that he had 

reviewed the plaintiff’s materials, and the court found that the 2010 amendments did not protect 

the materials from disclosure because they were not “counsel’s work product.” Id.

In a deceptive advertising case, the Sara Lee court addressed a defense expert 

who was “retained to testify about one of Plaintiff’s advertisements and to consult, but not 

testify, about another.” 273 F.R.D. at 417. The court determined that the defendant need not 
25 

produce materials because that clearly “relate[d] solely to [the expert’s] role as consultant, even 

taking into account the preference for disclosure when dealing with an expert who wears two 

hats,” because the expert’s work as to one advertisement was clearly discrete from his work as to 

the other. Id. at 420. Assuming arguendo that the materials did relate to the expert’s role as a 

testifying expert under Rule 26(a)(2)(B), the Sara Lee court found that “[n]one of the 

communications contain[ed] facts, data, or assumptions that [the expert] could have considered 

in assembling his expert report,” and the communications were thus all protected 

communications between the attorneys and expert under Rule 26(b)(4)(C). Id. at 420–21. The 

proponent did not show “substantial need” for the materials under Rule 26(b)(3)(A) because it 

had “examined the data and methods underlying [the] report, deposed [the expert] about the 

report, and retained its own expert to rebut the report.” Id. at 421. 

Similarly, in Employees Committed for Justice v. Eastman Kodak Co., 251 F.R.D. 

101, 105 (W.D.N.Y. 2008), an employment discrimination case, the court found that the dual-hat 

expert’s proffered expert testimony, regarding statistical analysis of employee data performed in 

2008, was “not sufficiently related to the consultative analyses he conducted in 2003 and 2004 to 

require disclosure.” 

III. ANALYSIS 

Abbott’s requests can be broken into two broad categories: (1) documents related 

to the 2003 experiments, and (2) Dr. Engelmann’s royalty agreement with other Yeda inventors. 

The Court will address each in turn. 

A. 2003 Experiment Materials 

Within the category of documents reviewed or prepared by Dr. Engelmann related 

to the 2003 experiments, referred to generally as “the 2003 documents,” Abbott seeks five 

groups of documents: 
26 

(1) Dr. Engelmann’s notes relating to the 2003 experiments, (2) 

Dr. Engelmann’s report concerning the 2003 experiments; (3) Dr. 

Rubenstein’s report relating to the 2003 experiments (which Dr. 

Engelmann reviewed); (4) all documents reflecting Dr. 

Engelmann’s analysis of the sequencing data from the 2003 

experiments; and (5) all documents relating to the experiments that 

Dr. Engelmann conducted or participated in involving the 

protocols and procedures in Abbott’s patent applications. 

 

Abbott Mem. at 10. Yeda opposes the request in its entirety. 

Abbott argues that Rule 26(a)(2)(B) requires Yeda to disclose all of these 

materials as “facts or data” considered by Dr. Engelmann in his role as a testifying expert. 

Abbott Mem. at 4–5; see also Abbott Reply at 3–4 (arguing that even if Dr. Engelmann were a 

consultant under Rule 26(b)(3)(A) in 2003, “his role in this litigation has now changed,” making 

the earlier reports “discoverable under Rule 26(a)(2)(B) because they constitute ‘facts or data’ 

considered by a testifying expert”). Abbott relies heavily on the 2010 Advisory Committee 

Notes, especially the observation that an “expert’s testing of material involved in litigation, and 

notes of any such testing, would not be exempted from discovery by this rule.” Abbott Mem. at 

4–5. Abbott argues that Yeda must disclose these documents because: “(1) Dr. Engelmann 

‘considered’ the withheld documents for purposes of Rule 26 disclosure; (2) the withheld 

documents consist of ‘factual material’ that does not contain the theories or mental impressions 

of counsel; and (3) the withheld documents relate to the subject matter of Dr. Engelmann’s 

expert reports.” Id. at 5. 

Yeda argues that Abbott’s request should be denied because “(i) the reports fall 

squarely within the immunity from discovery provided by the attorney work-product doctrine[ ] 

and (ii) Yeda has not waived that immunity by having Dr. Engelmann testify about the 

experiments he performed in 1989 (as reflected in Yeda’s 339 Application) and protein 

purification and isolation in general.” Yeda 1st Opp. at 1. Yeda argues that the reports are 
27 

protected by consulting expert immunity under Fed. R. Civ. P. 26(b)(4)(D) because “Dr. 

Engelmann has expressed no opinion regarding whether the 072 [A]pplication or 089 

[A]pplication describe[ ] or enable[ ] a protein satisfying the limitations required by the Count, 

and he will offer no such testimony at trial,” making him a “non-testifying consultant ‘who is not 

expected to be called as a witness at trial’ concerning the 2003 experiments.’” Id.

Analyzing Abbott’s request requires the Court to address three issues. First, 

Abbott asserts that Yeda has not shown ab initio that Dr. Engelmann was ever retained as a 

consultant in 2003, much less that he was retained in connection with the United States patent 

litigation. The Court rejects this argument. The Court finds that United States law applies and 

that there is a potential dual-hat expert problem because Dr. Engelmann served Yeda as a nontestifying consultant and has been designated as a testifying expert witness. Second, the Court 

briefly addresses Yeda’s argument that the documents requested by Abbott are opinion work 

product that deserves absolute protection. Third, the ultimate question is: are the documents 

detailing Dr. Engelmann’s 2003 experiments relevant to his expert testimony in this case? The 

answer to this third question effectively controls the ultimate ruling on Abbott’s discovery 

motion. 

1. Dr. Engelmann’s Documents Were Prepared “In Anticipation of” United 

States Litigation, So United States Law Applies, and the Documents Are 

Protected Work Product Unless Yeda Has Waived the Privilege 

As a threshold matter, Abbott contends that Yeda has not established “the factual 

predicates for either the work product doctrine or the applicability of Rule 26(b)(4)(D)”—i.e., 

that the documents were prepared by (or at the request of) an attorney in anticipation of 

litigation. Abbott Reply at 2. Abbott argues that “Yeda fails to provide any documentary 

evidence showing that Yeda’s attorneys engaged Dr. Engelmann in 2003 to serve as a consultant 

in connection with either the European patent proceeding or the U.S. proceeding in this case.” 
28 

Id. at 3. As a corollary to this assertion—in an argument admittedly raised for the first time in its 

reply brief—Abbott argues that, without a firmer link between the 2003 experiments and this 

litigation, U.S. law may not apply to this dispute because some of the 2003 experiments took 

place in Europe in the context of the European patent proceedings. Abbott asserts: “[I]f the Yeda 

lawyers who engaged Dr. Engelmann in 2003 were non-U.S. lawyers—or if the relevant 

‘litigation’ was the European patent proceeding (as opposed to a U.S. proceeding)—the court 

would likely not even apply U.S. privilege law to Yeda’s work product claims.” Abbott Reply at 

3 (citing Astra Aktiebolag v. Andrx Pharms. Inc., 208 F.R.D. 92, 98 (S.D.N.Y. 2002)). 

Yeda responds that, because “the consultants’ reports were prepared by Drs. 

Engelmann and Rubenstein at the request of Yeda’s counsel, with an eye toward both the 

proceedings in Europe and the first § 146 case before Judge Urbina in this Court,” the workproduct doctrine protection of Fed. R. Civ. P. 26(b)(3)(A) applies. Yeda 1st Opp. at 14. At oral 

argument, Yeda’s counsel acknowledged they have no immediate ability to produce a consulting 

agreement between Dr. Engelmann and United States lawyers from 2003 because a different law 

firm represented Yeda at that time. However, Yeda did produce documentation 

contemporaneous with the first district court case supporting its assertions, including e-mail 

correspondence among the parties’ counsel discussing logistics for Yeda’s experts to attend the 

first phase of the 2003 experiments in Ludwigshafen. See Yeda Documentation, June 5, 2013 

Hr’g Ex. 1. In the e-mails sent on January 30, 2003, then-counsel for Yeda wrote: “Our expert’s 

name is Dr. Hartmut Engelmann,” and counsel for Abbott acknowledged the e-mail, providing 

the address for Abbott’s lab and stating “Dr. Engelmann should ask for Dr. Hillen on arrival.” 

Id.
29 

The Court thus finds that Dr. Engelmann was retained as a consulting expert in 

connection with United States litigation in 2003. As Yeda’s documentation shows, in January 

2003, immediately before the experiments in Germany that began on February 2, 2003, United 

States attorneys viewed Dr. Engelmann as their consultant in connection with the predecessor to 

this case, Abbott v. Yeda, Civil No. 00-1720 (RMU). At that time, the case before Judge Urbina 

had been ongoing for almost three years, and it clearly implicated the validity of Abbott’s 089 

Application. In the 2003 experiments, Abbott repeated Example 2 of the 072 Application, which 

is also Example 2 of the 089 Application and the 915 Patent. See Bradshaw Decl. ¶¶ 38–39, 

Engelmann Decl. ¶ 7. The validity of the 915 Patent was also at issue in the first case before 

Judge Urbina. See Abbott I at *7, Abbott III, 576 F. Supp. 2d at 51 (finding that the Board 

committed clear error in invalidating Abbott’s 915 Patent). Yeda has noted that Abbott used the 

2003 experiment results, at least indirectly, in the first district court case. Yeda 2d Opp. at 5. 

Thus, the documents that Dr. Engelmann prepared in connection with 2003 experiments (as well 

as those connected to Yeda’s subsequent testing) “can fairly be said to have been prepared or 

obtained because of the prospect of litigation” that was ongoing in this court. See Boehringer 

Ingelheim Pharms., 286 F.R.D. at 107. United States law thus applies. Moreover, unless the 

privilege was later waived, documents prepared by Dr. Engelmann as Yeda’s consultant in 

connection with the 2003 experiments are protected from discovery by the work product 

privilege. See id.; Fed. R. Civ. P. 26(b)(4)(D) (“Ordinarily, a party may not . . . discover facts 

known or opinions held by an expert who has been retained or specially employed by another 

party in anticipation of litigation or to prepare for trial and who is not expected to be called as a 

witness at trial.”); see also Fed. R. Civ. P. 26(b)(3)(A) (protecting from discovery “documents 
30 

and tangible things that are prepared in anticipation of litigation or for trial by or for another 

party or its representative (including the other party’s . . . consultant . . . )”). 

2. The Nature of the Work Product Protection Ascribed to the 2003 

Documents 

In its briefs and at oral argument, Yeda suggested that the 2010 amendments to 

Rule 26 require the Court to ascribe absolute protection to the 2003 documents because they 

contain “the mental impressions, opinions, and conclusions of Yeda’s consultants, as informed 

by Yeda’s lawyers.” Yeda 2d Opp. at 1. Abbott, of course, disagrees. See Abbott Reply at 4 

(asserting that “the experimental data and factual observations of two protein chemists” cannot 

“reveal the ‘mental impressions of counsel’”). Although this strand of argument is by no means 

the bedrock of Yeda’s justification for opposing Abbott’s motion to compel, the Court will 

clarify briefly the effect of the 2010 amendments on expert discovery. 

It is true, as Yeda observes, that portions of Rule 26 were amended in 2010 with 

the goal of slightly reducing the universe of discoverable information with relation to testifying 

expert witnesses. But Yeda misunderstands the amendments, which were intended to “exclud[e] 

theories or mental impressions of counsel” from discovery, 2010 Ad. Comm. note (emphasis 

added), not theories or mental impressions of experts. It was the disclosure of attorney-expert 

communications, including attorney work product, that the Advisory Committee was attempting 

to arrest. See id.; Fed. R. Civ. P. 26(b)(4)(C) (protecting from disclosure “communications 

between the party’s attorney and any witness required to provide a report under Rule 

26(a)(2)(B),” subject to three exceptions). The higher standard of protection for which Yeda 

argues would be implicated if this case involved only work performed by Dr. Engelmann as a 

consulting expert. Then, Dr. Engelmann’s work product would be subject to the showing of 

need under case law or the Federal Rules. See Fed. R. Civ. P. 26(b)(3)(A), Fed. R. Civ. P. 
31 

26(b)(4)(D)(ii). The problem that Yeda must confront is whether it waived the work product 

privilege that would otherwise be applicable to Dr. Engelmann’s consulting materials when (and 

if) those materials became “facts or data” he “considered” as a testifying expert in this case. This 

problem is unchanged by the 2010 amendments to Rule 26. 

3. Yeda’s Designation of Dr. Engelmann as a Testifying Expert in this Case 

Waives the Work-Product Privilege Under the Dual-Hat Expert Doctrine 

Yeda has designated Dr. Engelmann as a testifying expert, making him subject to 

disclosure of “a complete statement of all opinions the witness will express and the basis and 

reasons for them” and “the facts or data considered by the witness in forming them.” Fed. R. 

Civ. P. 26(a)(2)(B). Thus, Dr. Engelmann “alternately dons and doffs the ‘privileged hat’ of a 

litigation consultant and the ‘non-privileged hat’ of the testifying witness.” Reyes, 2007 WL 

963422, at *1. 

Yeda asserts that Dr. Engelmann need not disclose the 2003 documents because 

the 2003 experiments are simply irrelevant to the present proceeding before the Court, and the 

Court should thus find that the materials retain work product protection because they were 

“generated or considered uniquely in the expert’s role as consultant.” See id. (citing B.C.F. Oil 

Refining, Inc., 171 F.R.D. at 61–62). Yeda asserts that “there is a clear distinction between Dr. 

Engelmann’s previous role as a consultant,” in which he “served as Yeda’s representative at the 

2003 experiments and interpreted those experiments for Yeda’s counsel,” “and his current role as 

a testifying expert,” in which he explains the 1989 experiments and the lead-up to Yeda’s 443 

Application, as well as “multi-step chromatography procedures” generally. Yeda 1st Opp. at 18; 

see also Yeda 2d Opp. at 16 (referring to a “clear line of demarcation”). Yeda argues that Dr. 

Engelmann was not designated as a testifying expert in the first district court case, “so there is no 

ambiguity that the documents were prepared by Drs. Engelmann and Rubenstein in their roles as 
32 

consultants,” Yeda 2d Opp. at 3. See Reyes, 2007 WL 963422, at *1–2 (“Thus, ‘documents 

having no relation to the expert’s role as [a witness] need not be produced . . . .’” (quoting B.C.F. 

Oil Refining, Inc., 171 F.R.D. at 62)). 

Yeda is correct to the extent that there is a temporal line of demarcation between 

the 2003 experiments and these proceedings. The documents at issue were clearly prepared by 

Dr. Engelmann in his capacity as a consultant. However, whether time has passed is not the 

pertinent inquiry; instead, the question is the extent of the substantive relationship between Dr. 

Engelmann’s two expert roles. In so doing, “the scope of the privilege must be narrowly 

construed against the expert’s proponent,” Reyes, 2007 WL 963422, at *1–2 (citing City of 

Torrance, 163 F.R.D. at 593), and a court “should order disclosure when there is at least an 

ambiguity as to whether the materials informed the expert’s opinion,” Monsanto, 214 F.R.D. at 

547. The presumption in favor of the party seeking discovery means that “if the subject matter 

directly relates to the opinion in the expert report, there will be at least an ambiguity as to 

whether the materials informed the expert’s opinion,” and consulting materials should be 

disclosed. Id.

Abbott responds that Dr. Engelmann’s expert report “disputes the conclusions of 

Abbott’s experts, including their conclusions that (1) the 072 Application discloses the same 

TBP-II protein as the 915 Patent[,] and (2) the 072 Application sets forth a reliable and effective 

protocol for isolating and purifying novel proteins.” Abbott Mem. at 4. In Abbott’s view, the 

2003 documents relate to the subject matter of Dr. Engelmann’s expert testimony even if he does 

not expressly address the 2003 experiments because “the sole issue posed in this proceeding” is 

whether “the 072 Application enable[s] (and provide[s] an adequate written description of) the 

same normal TBP-II protein claimed in the 915 Patent.” Id. at 7–8. Abbott contends that “[t]he 
33 

entire purpose of Abbott’s 2003 experiments was to demonstrate—in the presence of Yeda’s 

own witnesses, including Dr. Engelmann—that the 072 Application enabled a person of ordinary 

skill in the art to isolate, purify and identify the same protein claimed in the 915 Patent.” Id. at 8. 

Moreover, Abbott argues, “in their expert reports, Abbott’s expert witnesses demonstrate at 

length why Abbott’s 2003 experiments support their conclusion that the 072 application enabled 

a skilled person to isolate, purify and characterize the same protein claimed in the 915 Patent.” 

Id. Essentially, because Dr. Engelmann is criticizing Abbott’s experts’ conclusion that the 

protocol set forth in the 072 Application was “effective and reliable” and because the 2003 

experiments were “designed to repeat every step in the very [same] protocol,” the “‘facts and 

data’ that Dr. Engelmann observed as a witness to Abbott’s 2003 experiments . . . plainly relate 

to the subject matter of his expert testimony.” Id.; see also Abbott Reply at 7 (“Dr. Engelmann’s 

observations of Abbott’s 2003 experiments—in which Abbott repeated the same protocol that 

Dr. Engelmann now criticizes as an expert witness in this case—are plainly relevant to his expert 

testimony.”). 

Yeda’s argument depends on the premise that, as a testifying expert, “Dr. 

Engelmann is in a unique position, having actually performed the experiments disclosed in 

Yeda’s patent applications and patents, to explain why what he did in 1989 was not the same as 

the protocol reported in the 072 [A]pplication.” Yeda 2d Opp. at 11. Thus, according to Yeda, 

the 2003 documents are “irrelevant to Dr. Engelmann’s role in developing his expert opinions in 

this case,” which are “directed to his own 1989 experiments and protein purification and 

isolation in general.” Yeda 1st Opp. at 18–19. Yeda characterizes the subjects of Dr. 

Engelmann’s expert testimony in this litigation as “(1) the 1989 experiments described in Yeda’s 

339 [A]pplication and the reasons that he performed those experiments; and (2) complexities 
34 

associated with purifying and identifying novel proteins using multi-step chromatography 

protocols.” Id. at 7 (citations omitted).13 “[W]hether the 072 [A]pplication is enabling has no 

relation to Dr. Engelmann’s testimony about the experiments he did in 1989 to isolate and purify 

TBP-II” or to his “testimony contrasting the 072 protocol with the experiments he performed in 

1989,” which is “offered only in response to Abbott’s expert’s opinion that the protocols are the 

‘same basic protocol.’” Id. at 19. Yeda thus contends that “Dr. Engelmann does not offer any 

opinion about the 089 [A]pplication,” does not offer “any opinion about the 072 [A]pplication, 

other than commenting that the protocol he performed (as reported in the 339 [A]pplication) 

considerably differed from the protocol reported in the 072 [A]pplication,” and does not offer 

“any opinion about the 2003 experiments.” Id. at 9. In Yeda’s view, “[a]ny reference Dr. 

Engelmann makes to the 072 [A]pplication protocol is solely in response to the opinions of 

Abbott’s experts who suggest that Abbott’s scientists used the same basic protocol Dr. 

Engelmann used.” Yeda 2d Opp. at 11. 

The Court finds the line of demarcation Yeda has drawn is more illusory than 

real. Counsel for Yeda acknowledged at oral argument that, in a nutshell, Dr. Engelmann’s 

expert testimony will be that the protocols Yeda performed in 1989 as a prelude to its 339 

Application are divergent from the protocols described in Abbott’s 072 Application. Such 

testimony is consistent with the theory of Yeda’s case in this § 146 proceeding, which is that the 

Board erred in determining that Abbott’s 915 Patent is entitled to priority based on the 

sufficiency of the 072 and 089 Applications. See Yeda 2d. Opp. at 4 (arguing that “the Board 

 

13 Specifically, according to Yeda, “[i]n his opening report, Dr. Engelmann provides background 

information regarding proteins and protein purification and characterization; background 

information regarding cellular receptors, TNF, and TNF-binding proteins; information about the 

level of ordinary skill in the art in 1989; and background information concerning Yeda’s 339 

[A]pplication.” Yeda 1st Opp. at 7. 
35 

reversibly erred because the 072 [A]pplication failed to provide a written description under 35 

U.S.C. § 112, ¶ 1 of a purified and isolated protein that satisfied all the limitations recited in and 

required by the Count.”). But the experiments Dr. Engelmann observed and opined about in 

2003 are, in fact, part of the very protocol contained in the 072 Application, as Dr. Engelmann 

himself acknowledges. See Engelmann Decl. ¶ 7 (“I was asked by Yeda’s counsel to represent 

Yeda by observing Abbott scientists attempt to practice the procedure described in Example 2 of 

Abbott’s German patent applications [072 and 089] and U.S. Patent No. 5,344,915 [915 

Patent].”). Moreover, Dr. Engelmann himself acknowledged reading at least his own 2003 

report in preparation for his fact deposition in this case, Jan. 16, 2012 Engelmann Dep. at 74, 

further demonstrating that the overlap in subject matter is sufficient to justify granting Abbott’s 

motion to compel. 

Yeda attempts to cast this case as involving purely legal disagreement with the 

standard applied by the Board or merely a question of the sufficiency of Yeda’s own patent 

applications, but Yeda cannot escape the trap into which it has fallen by using Dr. Engelmann, 

one of its original patent inventors, as both a consultant for the 2003 experiments and as an 

expert witness here. Even a man as highly educated as Dr. Engelmann cannot be expected to 

draw a mental line in the sand between information gleaned from a behind-the-scenes look at 

Abbott’s process in 2003 and information he learned otherwise. It would be impracticable to ask 

such a Herculean task of dual-hat experts, or even of experts generally; that is why courts eschew 

a subjective standard for whether a testifying expert has “considered” “facts or data,” see In re 

Commercial Money Center, 248 F.R.D. at 537, and why courts construe the dual-hat expert rule 

in favor of the party seeking discovery, City of Torrance, 163 F.R.D. at 593. 
36 

The Court finds that Yeda waived the work product protection of Dr. 

Engelmann’s work as a consultant in this case by designating him as a testifying expert witness. 

Accordingly, Abbott’s motion to compel as to the documents related to the 2003 experiment will 

be granted with respect to the five groups of documents Abbott seeks, subject to any attorney 

work product otherwise protected by amended Rule 26. 

B. Royalty Agreement 

The Court next turns to Abbott’s motion to compel production of the royalty 

agreement between Dr. Engelmann and other Yeda inventors. Abbott argues that, because Dr. 

Engelmann “is one of the named inventors in the Yeda patent application” and “will be testifying 

as an expert witness,” “the financial benefit that Dr. Engelmann will realize if Yeda were to 

prevail in this litigation and commercialize a product based on the TBP-II protein . . . is relevant 

to bias and credibility,” and thus the royalty agreements between Dr. Engelmann and Yeda 

should be produced. Abbott Mem. at 10. Yeda responds that Abbott’s request should be denied 

because “(i) it is wholly irrelevant to any issue in this case (e.g., while Yeda has challenged 

Abbott’s patent applications, Abbott has never challenged the sufficiency of Yeda’s 339 

Application or any other Yeda application); (ii) it is cumulative to evidence already provided to 

Abbott about royalties; and (iii) Abbott has refused to produce any of its own similar 

agreements” on relevance grounds. Yeda 1st Opp. at 1. Yeda also notes that the royalty 

agreement “is confidential and cannot be disclosed . . . without permission of all parties to the 

agreement.” Id.

A court may “limit . . . the extent of discovery otherwise allowed” upon a 

determination that the discovery sought is “(i) unreasonably cumulative or duplicative, or can be 

obtained from some other source that is more convenient, less burdensome, or less expensive,” if 

“(ii) the party seeking discovery has had ample opportunity to obtain the information by 

38 

Dr. Engelmann conducted or participated in involving the 

protocols and procedures in Abbott’s patent applications. 

A memorializing Order accompanies this Opinion. Because the parties’ briefs 

relied in part on materials that were filed under seal, the parties will be directed to prepare a joint 

proposed redacted version of this Opinion for approval and subsequent filing on the public 

docket. 

Date: June 7, 2013 /s/ 

ROSEMARY M. COLLYER 

United States District Judge