Patent Case Watch

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
Court
U.S. District Court for the Eastern District of Texas, Marshall Division
Case No.
No. 2:23-cv-00379, Dkt. No. 303
Decided
June 23, 2025
Judge
Roy S. Payne, M.J. — Marshall
Document
Memorandum Order
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 Expert . Kevin Jeffay, filed by Plaintiff Headwater Research LLC. Dkt. No. 175.

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. 178 in 2:23-cv-00352.

For the reasons discussed in the Court’s ruling on the parallel motion (Dkt. No. 324 in 2:23-cv-00352), the instant Motion is also GRANTED as to Dr. Jeffay’s opinions on (1) the OS-Switching NIA and (2) the iOS 7 through 10 NIA in his Invalidity and Rebuttal Reports, and otherwise DENIED.

SIGNED this 3rd day of January, 2012.

SIGNED this 23rd day of June, 2025.

ROY S. PAYNE

UNITED STATES MAGISTRATE JUDGE

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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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