Google’s PTAB barrage against K.Mizra draws hold-out accusation in latest filing

Context: ip fray recently reported on the venue battle between K.Mizra LLC and Google after Google dropped its Northern District of California declaratory judgment action and K.Mizra responded with an infringement suit in the Western District of Texas (April 13, 2026 ip fray article). The case involves U.S. Patent No. 8,438,120 (“machine learning hyperparameter estimation”) and U.S. Patent No. 8,144,717 (“wireless network initialization”). 

What’s new: In a fresh filing before the Patent Trial and Appeal Board (PTAB) of the United States Patent and Trademark Office (USPTO), K.Mizra sharply criticized Google’s broader litigation strategy, accusing the company of using its financial scale and parallel proceedings to pressure a smaller patent owner rather than resolve the dispute on the merits. The filing comes as Google continues to pursue PTAB challenges against K.Mizra patents.

Direct impact: K.Mizra is simply trying to portray Google’s petitions as the kind of duplicative and tactical conduct that may justify discretionary denial at the PTAB, where the USPTO has recently shown a greater willingness to reject petitions for policy reasons without reaching patent validity.

Wider ramifications: The dispute highlights a recurring fault line in U.S. patent litigation: big tech companies often rely on multi-front defense strategies spanning district courts and administrative tribunals, while patent owners characterize those tactics as expensive delays designed to force settlements.