Arguments in IPR Result in Prosecution Disclaimer Estopping Infringement Claim​

The magistrate judge recommended granting defendant's motion for summary judgment that plaintiff's infringement claims were estopped due to plaintiff's prosecution disclaimer in its response to intervenors' petition for inter partes review. "Regardless of whether an examiner or panel agreed with the patentee’s statement, the statement itself may result in disclaimer because it constitutes a representation to the public about the scope of the patent. [Plaintiff's] statements to the Patent Office in its preliminary response were clear and unmistakable. [Plaintiff] repeatedly emphasized that the TR 23.809 standards document does not describe a GGSN that preserves the PDP context after receiving an error indication because the GGSN marks the PDP context as invalid. . . . [Plaintiff's expert's] central thesis is that by complying with the TS 23.060 standard, [defendant's] network infringes. The problem is that the standard, and by extension [defendant's] network, includes a GGSN that marks the PDP context invalid."

Huawei Technologies Co. Ltd v. T-Mobile US, Inc. et al, 2-16-cv-00052 (TXED September 9, 2017, Order) (Payne, MJ)