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Patent opinions from the Eastern District of Texas and the U.S. Court of Appeals for the Federal Circuit

Weekly Digest
E.D. Tex.

Headwater Research LLC v. T-Mobile US, Inc. et al, No. 2:23-cv-00379 (E.D. Tex. June 23, 2025)

Granted in Part
Motion to Strike Daubert / Expert Challenges Damages
Court
U.S. District Court for the Eastern District of Texas, Marshall Division
Case No.
No. 2:23-cv-00379, Dkt. No. 302
Decided
June 23, 2025
Judge
Roy S. Payne, M.J. — Marshall
Document
Memorandum Order
Docket Entry
ORDER granting in part and denying in part 175 Sealed Motion
Length
1 page
Download Opinion (PDF)

IN THE UNITED STATES DISTRICT COURT

FOR THE EASTERN DISTRICT OF TEXAS

MARSHALL DIVISION

HEADWATER RESEARCH LLC, §

§ §

Plaintiff,

§ §

v.

§ CIVIL ACTION NO. 2:23-CV-379-JRG-RSP §

T-MOBILE USA, INC. and SPRINT

(LEAD CASE)

§

CORP.,

§

§ Defendants. §

MEMORANDUM ORDER

Before the Court is the Motion to Strike Certain Opinions of Defendant T-Mobile’s Damages Expert Laura B. Stamm, filed by Plaintiff Headwater Research LLC. Dkt. No. 172.

A substantively identical motion was filed in a parallel litigation: Headwater Research LLC v. Verizon Communications Inc., et al, 2:23-cv-00352-JRG-RSP. See Dkt. No. 175 in 2:23-cv-00352.

For the reasons discussed in the Court’s ruling on the parallel motion (Dkt. No. 322 in 2:23-cv-00352), the instant Motion is also GRANTED IN PART as to (1) the portions of paragraphs 17, 193-195, 215, and 258 in Ms. Stamm’s report relating to or discussing the 2018 investment offer to Verizon, and (2) to the iOS 7 non-infringing alternative in paragraph 93 of Ms. Stamm’s report, and otherwise DENIED.

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Cite this opinion

Headwater Research LLC v. T-Mobile US, Inc. et al, No. 2:23-cv-00379 (E.D. Tex. June 23, 2025).

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