Patent Case Watch

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

E.D. Tex.

Headwater Research LLC v. AT&T Inc. et al, No. 2:23-cv-00397 (E.D. Tex. Aug. 3, 2025)

Granted in Part
Daubert / Expert Challenges Motion to Strike
Court
U.S. District Court for the Eastern District of Texas, Marshall Division
Case No.
No. 2:23-cv-00397, Dkt. No. 274
Decided
August 3, 2025
Judge
Roy S. Payne, M.J.
Document
Memorandum Order
Docket Entry
ORDER granting in part and denying in part 135 Sealed Motion
Length
9 pages

From the Opinion

The passage below is extracted verbatim from the opening of the document. It has not been editorially summarized — consult the full opinion for the court's complete reasoning.

Before the Court is the Motion to Exclude or Strike Testimony of Robert LaGrone, filed by Plaintiff Headwater Research LLC. Dkt. No. 135. For the reasons discussed below, the Motion is GRANTED as to certain exhibits that Mr. LaGrone relies on, and otherwise DENIED. I. APPLICABLE LAW An expert witness may provide opinion testimony if “(a) the expert’s scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence or to determine a fact in issue; (b) the testimony is base…

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Source: govinfo.gov USCOURTS collection · retrieved July 23, 2026 · Report an error

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