1 

IN THE UNITED STATES DISTRICT COURT

FOR THE EASTERN DISTRICT OF TEXAS

MARSHALL DIVISION

HEADWATER RESEARCH LLC,

Plaintiff, 

 v. 

T-MOBILE US, INC., T-MOBILE USA, INC., 

and SPRINT CORP., 

Defendants. 

Civil Action No. 2:23-cv-00379-JRG-RSP

(Lead Case)

JURY TRIAL DEMANDED

HEADWATER RESEARCH LLC,

Plaintiff, 

 v. 

T-MOBILE US, INC., T-MOBILE USA, INC., 

and SPRINT CORP., 

Defendants. 

Civil Action No. 2:23-cv-00377-JRG-RSP

(Member Case)

JURY TRIAL DEMANDED

AGREED MOTION FOR VOLUNTARY DISMISSAL WITHOUT PREJUDICE OF

DEFENDANT T-MOBILE US, INC. 

Plaintiff and Defendants hereby jointly move to dismiss Defendant T-Mobile US, Inc. from 

the action pursuant to Federal Rule of Civil Procedure 21. Plaintiff and Defendants have agreed 

to dismiss T-Mobile US, Inc. without prejudice and without costs pursuant to Rule 21 on the 

grounds that it is not a proper party to the action. 

The parties agree that the caption should be revised as follows: 

Case 2:23-cv-00379-JRG-RSP Document 46 Filed 01/17/24 Page 1 of 4 PageID #: 402
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HEADWATER RESEARCH LLC,

Plaintiff,

 v.

T-MOBILE USA, INC. and SPRINT CORP.,

Defendants.

Civil Action No. 2:23-cv-00379-JRG-RSP

(Lead Case)

JURY TRIAL DEMANDED

HEADWATER RESEARCH LLC,

Plaintiff,

 v.

T-MOBILE USA, INC. and SPRINT CORP.,

Defendants.

Civil Action No. 2:23-cv-00377-JRG-RSP

(Member Case)

JURY TRIAL DEMANDED

Dated: January 17, 2024

Case 2:23-cv-00379-JRG-RSP Document 46 Filed 01/17/24 Page 2 of 4 PageID #: 403
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 /s/ Katherine Q. Dominguez

Katherine Q. Dominguez 

kdominguez@gibsondunn.com 

Josh A. Krevitt 

jkrevitt@gibsondunn.com 

Brian Rosenthal 

brosenthal@gibsondunn.com 

GIBSON, DUNN & CRUTCHER LLP

200 Park Avenue 

New York, NY 10166-0193 

Telephone: (212) 351-4000 

Facsimile: (212) 351-4035 

 Robert Vincent 

 rvincent@gibsondunn.com 

 GIBSON, DUNN & CRUTCHER LLP

 2001 Ross Avenue, Suite 2100 

 Dallas, Texas 75201-2923 

 Telephone: (214) 698-3100 

 Facsimile: (214) 571-2900 

Andrew Robb 

arobb@gibsondunn.com 

GIBSON, DUNN & CRUTCHER LLP

310 University Avenue 

Palo Alto, CA 94301 

Telephone: (650) 849-5300 

Melissa R. Smith

melissa@gillamsmithlaw.com

GILLIAM & SMITH, LLP

303 South Washington Avenue 

Marshall, TX 75670 

Telephone: 903-934-8450 

Facsimile: 903-934-9257 

Attorneys for Defendants 

 /s/ Marc Fenster

Marc Fenster

CA State Bar No. 181067 

Email: mfenster@raklaw.com

Reza Mirzaie

CA State Bar No. 246953 

Email: rmirzaie@raklaw.com

Brian Ledahl

CA State Bar No. 186579 

Email: bledahl@raklaw.com

Ben Wang

CA State Bar No. 228712 

Email: bwang@raklaw.com

Dale Chang

CA State Bar No. 248657 

Email: dchang@raklaw.com 

Paul Kroeger

CA State Bar No. 229074 

Email: pkroeger@raklaw.com 

Neil A. Rubin 

CA State Bar No. 250761 

Email: nrubin@raklaw.com 

Kristopher Davis 

CA State Bar No. 329627 

Email: kdavis@raklaw.com 

James S. Tsuei

CA State Bar No. 285530 

Email: jtsuei@raklaw.com

Philip Wang

CA State Bar No. 262239 

Email: pwang@raklaw.com

Amy Hayden

CA State Bar No. 287026 

Email: ahayden@raklaw.com

Jason M. Wietholter 

CA State Bar No. 337139 

Email: jwietholter@raklaw.com

RUSS AUGUST & KABAT

12424 Wilshire Blvd. 12th Floor 

Los Angeles, CA 90025 

Telephone: 310-826-7474 

Attorneys for Plaintiff 

Case 2:23-cv-00379-JRG-RSP Document 46 Filed 01/17/24 Page 3 of 4 PageID #: 404
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CERTIFICATE OF CONFERENCE

I hereby certify that, on January 3, 2024, counsel for T-Mobile conferred with counsel for 

Plaintiff Headwater Research LLC and that this Agreed Motion is unopposed. 

/s/ Katherine Q. Dominguez

 Katherine Q. Dominguez 

CERTIFICATE OF SERVICE

I hereby certify that on January 17, 2024, I caused the foregoing to be electronically filed 

with the Clerk of the Court using CM/ECF, which will send notification of such filing to all 

registered participants. 

 I further certify that I caused copies of the foregoing document to be served on January 

17, 2024, upon the following in the manner indicated: 

Marc Fenster VIA ELECTRONIC MAIL

Reza Mirzaie

Brian Ledahl

Ben Wang

Dale Chang

Paul Kroeger

Neil A. Rubin 

Kristopher Davis 

James S. Tsuei

Philip Wang

Amy Hayden

Jason M. Wietholter 

RUSS AUGUST & KABAT

12424 Wilshire Blvd. 12th Floor 

Los Angeles, CA 90025 

Telephone: 310-826-7474 

Attorneys for Plaintiff and Counterclaim-Defendant

 /s/ Katherine Q. Dominguez

Katherine Q. Dominguez 

Case 2:23-cv-00379-JRG-RSP Document 46 Filed 01/17/24 Page 4 of 4 PageID #: 405