William D. Marsh

William D. Marsh's known patent litigation experience primarily stems from his role as local counsel for plaintiff HyperQuery LLC in the case HyperQuery LLC v. Sony Electronics, Inc.. The underlying patent in this matter, U.S. Patent No. 9,529,918 B2, focused on systems and methods for downloading applications via a communication network, indicating a technology focus in software and mobile application distribution.

In this single tracked appearance, Mr. Marsh represented the plaintiff, a patent assertion entity, against Sony Corporation. The case, filed in the U.S. District Court for the Eastern District of Texas, concluded with a voluntary dismissal with prejudice in February 2026, approximately 13 months after its filing, without a judicial ruling on the merits. This early procedural exit is a pattern often observed in Eastern District of Texas patent litigation.

Mr. Marsh appeared for Marsh Law Firm in this matter. While a "Marsh Law Firm" is associated with the case, a comprehensive patent litigation practice for this specific firm or for William D. Marsh beyond this local counsel role could not be definitively established through publicly available information. Other attorneys named William D. Marsh or "Ms. Marsh" at other "Marsh Law" entities online appear to focus on diverse areas such as environmental law, estate planning, criminal defense, or general commercial litigation, or patent prosecution and advisory without extensive litigation records. There is no verifiable record of his regular involvement in PTAB or IPR proceedings.

Due to multiple attorneys sharing the name William D. Marsh and the limited public information pertaining specifically to his patent litigation practice as local counsel in Texas, reliable details on his bar admissions and education beyond this particular case engagement could not be definitively sourced and disambiguated for this specific individual.