Promptu Systems Corporation v. Comcast Corporation, et al.

District Court, E.D. Pennsylvania·Decided August 3, 2026·No. 2:16-cv-06516·Unknown

Opinion

IN THE UNITED STATES DISTRICT COURT FOR THE EASTERN DISTRICT OF PENNSYLVANIA

PROMPTU SYSTEMS CORPORATION : CIVIL ACTION : v. : No. 16-6516 : COMCAST CORPORATION, et al. :

MEMORANDUM Judge Juan R. Sánchez August 3, 2026

Defendants Comcast Corporation and Comcast Cable Communications, LLC (collectively, “Comcast”) move to compel production of 225 documents Plaintiff Promptu Systems Corporation withheld as protected by the attorney-client privilege. All of the withheld documents relate to the Glenn Patent Group report (the “GPG report”), a report prepared by Promptu’s outside patent prosecution counsel summarizing the results of counsel’s “prior art search for all issued or laid open US patent applications that [Promptu’s] Speech Recognition control system might infringe.” Defs.’ Ex. 14.1 Promptu prepared the report at Comcast’s request and provided the final report to Comcast in April 2004, ECF No. 221 at 2; however, it has withheld drafts of the report and a small number of emails regarding it (collectively, the “GPG materials”) on privilege grounds. Comcast argues the Court should order production of the withheld documents because Promptu’s revised privilege log2 fails to adequately substantiate its claim of privilege as to most of them, Promptu has waived the privilege by advancing an advice-of-counsel defense to Comcast’s inequitable conduct counterclaim, and disclosure is warranted under the crime-fraud

1 Citations in the form “Ex. __” are to the sequentially numbered exhibits to the motion to compel and the additional briefs in support of and in opposition to the motion.

2 Promptu served a revised privilege log in November 2025 after this Court directed it to identify the documents included in its original privilege log “that are drafts of the [Glenn Patent Group] Reports or communications attaching or discussing them.” ECF No. 448 at 1. exception to the privilege. Promptu disputes each of these contentions and additionally argues the motion to compel should be denied because the withheld documents are not relevant to the inequitable conduct counterclaim. For the reasons set forth below, the motion will be denied, except that the Court will direct Promptu to provide Comcast with additional information about

the actual recipients of the drafts of the GPG report if such information is available. A. Relevance Under Federal Rule of Civil Procedure 26(b)(1), “[p]arties may obtain discovery regarding any nonprivileged matter that is relevant to any party’s claim or defense and proportional to the needs of the case.” In the discovery context, relevance is “liberally construed to ‘encompass any matter that bears on, or that reasonably could lead to other matter that could bear on, any issue that is or may be in the case.’” Mammen v. Thomas Jefferson Univ., No. 20-127, 2021 WL 3782950, at *3 (E.D. Pa. Aug. 26, 2021) (quoting Oppenheimer Fund, Inc. v. Sanders, 437 U.S. 340, 351 (1978)); see also Katz v. Batavia Marine & Sporting Supplies, Inc., 984 F.2d 422, 424 (Fed. Cir. 1993) (“Relevancy for the purposes of Rule 26 is broadly construed.”). As the party seeking to

compel discovery, Comcast “bears the initial burden of proving that the information sought is relevant.” A.J. v. Mastery Charter High Sch., No. 22-2900, 2023 WL 6804576, at *6 (3d Cir. Sep. 20, 2023) (citation omitted).3

3 The Federal Circuit applies “the law of the circuit in which the district court sits with respect to nonpatent issues,” but applies its “own law to issues of substantive patent law.” In re Spalding Sports Worldwide, Inc., 203 F.3d 800, 803 (Fed. Cir. 2000). Procedural issues that are not themselves substantive law issues are “nonetheless governed by Federal Circuit law if the issue pertains to patent law, if it bears an essential relationship to matters committed to [the Federal Circuit’s] exclusive [jurisdiction] by statute, or if it clearly implicates the [Federal Circuit’s] jurisprudential responsibilities . . . in a field within its exclusive jurisdiction.” Id. (second alteration in original) (quoting Midwest Indus., Inc. v. Karavan, 175 F.3d 1356, 1359 (Fed. Cir. 1999) (en banc in relevant part)). Applying these principles, the Federal Circuit has held its own law applies to determinations of relevance for discovery purposes in a patent case. Truswal Sys. Corp. v. Hydro-Air Eng’g, Inc., 813 F.2d 1207, 1212 (Fed. Cir. 1987). Comcast argues the withheld documents are relevant to its inequitable conduct counterclaim, which is based in part on Promptu’s failure to disclose the Julia patent (U.S. Patent No. 6,513,063) to the United States Patent and Trademark Office (PTO) during prosecution of the applications for its own ʼ196 and ʼ538 patents. To prove inequitable conduct, the accused infringer

must show the applicant “misrepresented or omitted material information with the specific intent to deceive the PTO.” Freshub, Inc. v. Amazon.com, Inc., 93 F.4th 1244, 1252 (Fed. Cir. 2024) (quoting Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 1287 (Fed. Cir. 2011)). Intent to deceive may be “infer[red] from indirect and circumstantial evidence,” though it must be “the single most reasonable inference able to be drawn from the evidence.” Therasense, 649 F.3d at 1290 (citation omitted). The final GPG report reflects the results of an infringement analysis for Promptu’s AgileTV system. This analysis was based on a patent search conducted by Promptu’s outside counsel, Michael Glenn of the Glenn Patent Group, and involved comparing claims from the issued patents and patent applications identified in the search to Promptu’s system. See Ex. 16 at 20:16-24, 27:20-

28:23, 213:20-214:2. The determinations regarding potential infringement were made in meetings between Glenn and Promptu employees Paul Cook and David Redell. Id. The final report assigned the issued patents and patent applications a priority level from 1 to 4, indicating “their relationship to the AgileTV system and service as then envisioned.” Ex. 18 at TX-0230.0003. It identified the Julia patent as a “Priority 1” patent, meaning the “[t]ask accomplished is arguably similar to some aspect of the AgileTV system, but a careful reading of the independent claims shows that the technique(s) used by AgileTV are not covered by the patent.” Id. at TX-0230.0003, .0011, 0025.4

4 Although the final GPG report reflects the results of Promptu’s infringement analysis, it does not discuss the patents and patent applications considered beyond assigning them a priority level. See generally Ex. 18. A separate document provided a compilation of the abstract and independent Promptu argues drafts of the GPG report are irrelevant to the inequitable conduct counterclaim because the report concerns a noninfringement analysis for the Agile TV system, not a patentability analysis of the ʼ196 and ʼ538 patents and, as such, considered only whether the AgileTV system infringed others’ patents, not whether prior art would preclude Promptu’s patents.

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Promptu Systems Corporation v. Comcast Corporation, et al., (E.D. Pa. 2026).

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