Court Opinion

ID: 9878107
Source: CourtListenerOpinion
Date Created: 2023-09-27 16:40:18.281546+00
Date Added: 2024-06-11T07:47:31.965883
License: Public Domain

Opinion for the court filed by
Circuit Judge MOORE.
Stepan Company (“Stepan”) appeals from a decision of the Patent Trial and Appeal Board (“Board”) affirming the examiner’s rejection of claims 1-31 of U.S. Patent Application No. 12/456,567 (“the ’567 application”). For the reasons discussed below, we vacate and remand.
Background
The ’567 application is directed to herbicidal formulations containing glyphosate salt with a surfactant system.'Surfactants can enhance glyphosate’s effectiveness as' an herbicide by providing better adherence to leaves, thereby enhancing penetration. According to the specification, “[t]he present invention is based on the unexpected discovery that surfactant systems comprising dialkoxylated alkylamine, water miscible solubilizer and amine oxide allow for formulation of, ultra-high loaded (‘high-strength’) glyphosate salt concentrates possessing high or no cloud points.” J.A. 29 ¶ 13. A cloud point is the temperature at which a solution becomes cloudy due to the surfactants becoming insoluble and separating into layers. Cloudiness can be avoided if the cloud point is higher than the solution’s temperature or if the solution is cooled before adding the surfactant, The specification explains that because glyphosate salt is created at about 75°C, it is advantageous to formulate glyphosate with a surfactant system exhibiting a high cloud point to “obviate the' necessity of waiting for the temperature of the glypho-sáte salt reaction product to cool down.” J.A. 27-28 ¶ 7. Surfactant systems with high cloud points or -no cloud point,' in which the solution never becomes cloudy, allow for quicker formulation of glyphosate concentrates and thus quicker delivery to the market. Id.
Claim 1 is the sole independent claim:
1. An ultra-high load, aqueous glypho-sate salt-containing concentrate comprising:
a. water;
b. glyphosate salt in solution in the water in an amount greater than about 39 weight percent of acid equivalent, based on the weight of the concentrate, said glyphosate salt being selected from- the group consisting of the isopropylamine salt' of glyphosate, the potassium salt of glyphosate, mixtures of the' isopropylamine salt' and the potassium salt of glyphosate and mixtures of the potassium salt and the ammonium salt of glyphosate;
c. a surfactant system in an amount ranging from about 1 to about 20 weight percent, based on the weight of the concentrate, comprising:
*1345i. from about 10 to about 60 weight percent, based on the weight of the surfactant system, of one or more dialkoxylated alkylamines;
ii. from about 5 to about 30 weight percent, based on the weight of the surfactant system, of one or more water miscible solubilizers; and
iii. from about 30 to about 75 weight percent, based on the weight of the surfactant system, of one or more amine oxides;
said concentrate having a cloud point above at least 70°C. or no cloud point when the concentrate is heated to its boiling point.
Several dependent claims further limit the surfactant system of claim 1. For example, claims 20-24 specify that the dialkoxylated alkylamine is diethoxylated tallow amine. Claim 26 specifies that the water miscible solubilizer is a polyalkylene glycol with a molecular weight from about 200 to about 1000, and claim 27 further limits the water miscible solubilizer to polyethylene glycol. Claim 29 states the amine oxide is selected from a group of six amine oxides, among which includes lauryl dimethylamine oxide.
The examiner rejected claims 1-25 and 28-31 for obviousness over U.S. Pub. No, 2003/0087764, titled “Stable Liquid Pesticide Compositions” (“Pallas”). Pallas discloses highly-loaded glyphosate compositions containing surfactants having a cloud point of at least 50°C and ideally 60°C. Relevant to Stepan’s appeal, the examiner found Pallas teaches preferred surfactants “includ[ing] the amine oxide lauryl dime-thylamine oxide (Chemoxide [L70]) and the dialkoxylated amine diethoxylated tallow amine (Ethomeen T).” J.A. 653 (citing J.A. 750-52 ¶¶ 115-16, 119-20). She found that Pallas teaches a surfactant component “may optionally contain glycols such as polypropylene glycol.” J.A. 653 (citing J.A. 757-58' ¶¶ 152-55). For the claimed ranges of the surfactants, she found “it is routine ■optimization -to select and adjust the surfactants to this range since Pallas teaches the surfactant component comprises any combination of surfactants.” J.A. 653, The examiner found Pallas does not teach a cloud point above 70°C but that achieving this cloud point would be a matter of “optimizing the formulation” because Pallas teaches the ideal cloud point should be above 60°C. J.A. 653 (citing J.A. 735 ¶ 29).
The examiner rejected claims 26 and 27 over Pallas in view of U.S. Patent No. 5,843,866, titled “Pesticidal Compositions Comprising Solutions of Polyureá and/or Polyurethane” (“Parker”). The examiner found Pallas does not teach the specific water miscible solubilizer polyethylene glycol with a molecular weight from about 200 to about 1000, but Parker discloses polyethylene glycol 600 in a surfactant system mixed with tallow amine and uséd with glyphosate. She found a skilled artisan “would have been motivated to make the formulation because Parker et al. teach that surfactant systems for glyphosate were known to have polyethylene glycol 600 with tallow amine surfactants.” J.A. 656-57.
The Board adopted the examiner’s findings in support of rejection and agreed with her conclusion that claims 1-31 would have been obvious. It determined Stepan failed to rebut the examiner’s prima facie case of obviousness and affirmed the examiner’s rejections. Stepan appeals. We have jurisdiction pursuant to 28 U.S.C. § 1295(a)(4)(A).
Discussion
We review the Board’s factual findings for substantial evidence and its legal determinations de novo. In re Van Os, 844 F.3d 1359, 1360 (Fed. Cir. 2017). Obviousness is a question of law based on subsidiary findings of fact. Id. An obviousness determination requires finding both *1346“that a skilled artisan would have been motivated to combine the teachings of the prior art ... and that the skilled artisan would have had a reasonable expectation of success in doing so.”1 Intelligent BioSys., Inc. v. Illumina Cambridge Ltd., 821 F.3d 1359, 1367-68 (Fed. Cir. 2016). Whether a person of ordinary skill in the art would have been motivated to modify or combine teachings in the prior art, and whether he would have had a reasonable expectation of success, are questions of fact. Id. at 1366.
The Board found Stepan failed to provide evidence that it would not have been routine optimization for a skilled artisan to select and adjust the claimed surfactants to achieve a cloud point above at least 70°C “since Pallas teaches the surfactant component comprises any combination of surfactants” and “teaches the ideal cloud point should be above 60[°C].” J.A. 8-9. It rejected evidence in Pallas that certain surfactant combinations failed the cloud point test at 60°C because it concluded that these failures did not involve the claimed surfactants. J.A. 9. It found Step-an failed to establish the criticality of its claimed range of surfactants, showing neither that a 70°C cloud point was unexpectedly good nor that the prior art was silent on the connection between optimizing surfactants and cloud point. J.A. 10. Because the Board failed to adequately articulate its reasoning, erroneously rejected relevant evidence of nonobviousness, and improperly shifted to Stepan the burden of proving patentability, we vacate the Board’s decision that claims 1-31 of the ’567 application would have been obvious.
The Board failed to explain why it would have been “routine optimization” to select and adjust the claimed surfactants and achieve a cloud point above at least 70°C. See J.A. 8-9. “The agency tribunal must make findings of relevant facts, and present its reasoning in sufficient detail that the court may conduct meaningful review of the agency action.” In re Lee, 277 F.3d 1338, 1346 (Fed. Cir. 2002). Stating that a person of ordinary skill in the art would have arrived at the claimed invention through routine optimization falls short of this standard. Missing from the Board’s analysis is an explanation as to why it would have been routine optimization to arrive at the claimed invention. Similar to cases in which the Board found claimed inventions would have been “intuitive” or “common sense,” the Board must provide some rational underpinning explaining why a person of ordinary skill in the art would have arrived at the claimed invention through routine optimization. See, e.g., Van Os, 844 F.3d at 1361 (“Absent some articulated rationale, a finding that a combination of prior art would have been ‘common sense’ or ‘intuitive’ is no different than merely stating the combination “would have been obvious.’ ”); Arendi S.A.R.L. v. Apple Inc., 832 F.3d 1355, 1362 (Fed. Cir. 2016) (“[Rjeferences to ‘common sense’ ... cannot be used as a wholesale substitute for reasoned analysis and evi-dentiary support.... ”). Absent some additional reasoning, the Board’s finding that a skilled artisan would have arrived at the claimed invention through routine optimization is insufficient to support a conclusion of obviousness.
*1347The PTO argues substantial evidence supports the Board’s finding that formulating the claimed surfactant system with a cloud point above at least 70°C would have been a matter of routine experimentation. It argues the thousands of formulations screened by Pallas indicate the routine nature of combining the surfactants and testing their cloud point. PTO Br. 24 (citing generally J.A. 761-99 ¶¶ 194-386). It argues these tests can be easily conducted in a short period of time and would have been tested by a skilled artisan as a matter of course. Oral Arg. at 28:03-42. And it argues a skilled artisan would have selected the claimed surfactant system among those disclosed because Pal-las teaches, inter alia, that amine oxides and dialkoxylated alkylamines are two of only four preferred surfactants. PTO Br. 21-22, 29 (citing J.A. 754 ¶ 130). This evidence could be relevant to whether there would have been a motivation to combine the claimed surfactants with a reasonable expectation of achieving a cloud point above at least 70°C. The Board, however, did not make any of these findings. We “may not accept appellate counsel’s post hoc rationalization for agency action.” Lee, 277 F.3d at 1345 (quoting Burlington Truck Lines, Inc. v. United States, 371 U.S. 156, 168, 83 S.Ct. 239, 9 L.Ed.2d 207 (1962)). We leave it to the Board to assess these arguments on remand.
Nor did the Board articulate why a person of ordinary skill in the art would have had a reasonable expectation of success to formulate the claimed surfactant system with a cloud point above at least 70°C. The Board’s purported explanation that “Pallas teaches the surfactant component comprises any combination of surfactants” and “teaches the ideal cloud point should be above 60[°C]” does not indicate whether a skilled artisan would have had a reasonable expectation of success. J.A. 8-9. “[T]o have a reasonable expectation of success, one must be motivated to do more than merely to vary all parameters or try each of numerous possible choices until one possibly arrived at a successful result.” Pfizer, Inc. v. Apotex, Inc., 480 F.3d 1348, 1365 (Fed. Cir. 2007) (quoting Medichem, S.A. v. Rolabo, S.L., 437 F.3d 1157, 1165 (Fed. Cir. 2006)). Reciting Pallas’ teachings that “any combination” of surfactants may be used and that a cloud point above 60°C is desired fails to illuminate why a skilled artisan would have selected the claimed combination of surfactants and reasonably expected a cloud point above at least 70°C.
Moreover, the Board undisputedly erred to the extent that it concluded the failures in Pallas did not involve the claimed surfactants. Stepan presented evidence demonstrating that none of the examples in Pallas include all three of the claimed surfactants and that the closest examples failed to achieve a cloud point above at least 70°C. It argued Pallas’ Example 76 includes a dialkoxylated alkylamine and water miscible solubilizer, but not an amine oxide, and failed the cloud point test at 60°C. It argued Pallas’ Example 127 includes a dialkoxylated alkylamine and amine oxide, but not a water miscible solu-bilizer, and failed the cloud point test at 60°C. The Board conflated Stepan’s arguments regarding Examples 76 and 127 and held that neither example was relevant because they “are not comparative with Pallas]’] disclosed preferred amine oxide surfactants.” J.A. 9. The PTO does not dispute that Example 127 in fact contains an amine oxide, thus the Board’s basis for disregarding this evidence lacks support. In any event, because both examples contain two of the three claimed surfactants and were tested for cloud point, both ex-, ampies are relevant to whether a skilled artisan would have had a reasonable expectation of success to achieve a cloud point above at least 70°C with the claimed *1348surfactant systems.2 We do not reach in the first instance what weight these examples ought to be afforded in the Board’s obviousness analysis, but instruct the Board to consider this evidence on remand.
Lastly, the Board erred when it shifted the burden of proving patentability to Stepan. The PTO bears the burden of establishing a prima facie case of obviousness. In re Deuel, 51 F.3d 1552, 1557 (Fed. Cir. 1995). “Only if this burden is met does the burden of coming forward with rebuttal argument or evidence shift to the applicant.” Id. In holding that Stepan had not met its burden, the Board cited case law in which the patentee claimed a range within the prior art and had to rebut a prima facie case of obviousness by showing criticality of its claimed range. See J.A. 10. This line of case law does not apply here for two reasons. First, for the reasons discussed above, the Board did not establish a prima facie case of obviousness because it failed to adequately articulate its reasoning. See In re Kahn, 441 F.3d 977, 986 (Fed. Cir. 2006) (“[T]o establish a pri-ma facie case of obviousness based on a combination of elements disclosed in' the prior art, the Board must articulate the basis on which it concludes that it would have been obvious to make the claimed invention.”). Second, Stepan’s ’567 application does not merely claim a range of surfactants that is within or overlaps with the range of surfactant systems taught by Pallas. The claimed surfactant system contains four elements. The first -three elements describe the surfactants, and their respective ranges, that comprise the surfactant system. The fourth element limits the combination of those surfactants to only those combinations- that produce a cloud point above at least 70°C or no cloud point at all. The cloud point thus limits and defines the scope of what surfactant combinations satisfy the claimed composition. It therefore may be that not all compositions that contain the claimed combination and range of ■ surfactants fall within the claims. As an element of the composition claim's, it was the 'PTO’s — not Stepan’s— burden to show that achieving a cloud point above 70°C would have been obvious to a person of ordinary skill in the art! To the extent the Board shifted the burden to Stepan to show the criticality of the cloud point element, the Board erred.
Conclusion
We have considered Stepan’s remaining arguments for vacatur and do not disturb the Board’s decision on those bases. For the reasons discussed above, we vacate the Board’s decision holding claims 1-31 of the ’567 application would have been obvious and remand for further proceedings consistent with this opinion.
VACATED AND REMANDED
Costs
Costs to Stepan.

. The dissent suggests the PTO need not establish a reasonable expectation of success where there is a single prior art reference. See Dissent at 1349. We do not agree. Whether a rejection is based on combining disclosures from multiple references, combining multiple embodiments from a single reference, or selecting from large lists of elements in a single reference, there must be a motivation to make the combination and a reasonable expectation that such a combination would be successful, otherwise a skilled artisan would not arrive at the claimed combination.

. We note that while claim 1 recites a surfactant system comprising a dialkoxylated alkyla-mine, water miscible solubilizer, and amine oxide, several of the ’567 application’s dependent claims recite specific compounds within those categories of surfactants. .To the extent these dependent claims are separately argued, the Board’s reasonable expectation of success analysis must extend to these specific surfactant systems.