MEMORANDUM OPINION and ORDER
WILLIAM K. SESSIONS, III, District Judge.
Defendants (collectively "AMoHS") have moved pursuant to Rule 45(c)(3) of the Federal Rules of Civil Procedure to quash deposition subpoenas directed to the law firm of Downs Rachlin Martin PLLC ("DRM") and attorney Lawrence Meier, Esq. The motion, ECF No. 118, is granted in part and denied in part, as set forth in more detail below.
DRM represents AMoHS in this lawsuit seeking a declaration that the patent claims of U.S. Patent Number 4, 915, 435 ("the 435 patent") are invalid, and Meier is one of the lead attorneys in that representation. AMoHS contends that the attempts to depose its counsel are an abuse of the discovery process and are not reasonably calculated to lead to the discovery of admissible evidence.
AMoHS has counterclaimed against Plaintiff Mobile Medical International Corp. ("MMIC") for "direct and indirect patent infringement." Am. Countercl. Count I, ECF No. 88. Among its defenses to the Amended Counterclaim, MMIC alleges that the patent is unenforceable because patentee and counsel were aware of multiple materially relevant prior art references that they did not cite during examination or reexamination of the 435 patent. Answer 7-8, ECF No. 92.
"Inequitable conduct is an equitable defense to patent infringement that, if proved, bars enforcement of a patent." Therasense, Inc. v. Becton, Dickinson & Co. , 649 F.3d 1276, 1285 (Fed. Cir. 2011) (en banc). The defense of inequitable conduct is an issue of substantive patent law. See, e.g., Brigham & Women's Hosp. Inc. v. Teva Pharms. USA, Inc. , 707 F.Supp.2d 463, 469 (D. Del. 2010). "Federal Circuit law applies when deciding whether particular written or other materials are discoverable in a patent case, if those materials relate to an issue of substantive patent law.'" In re EchoStar Commc'ns Corp. , 448 F.3d 1294, 1298 (Fed. Cir. 2006) (quoting Advanced Cardiovascular Sys. v. Medtronic, Inc. , 265 F.3d 1294, 1307 (Fed. Cir. 2001)); see also In re Spalding Sports Worldwide, Inc. , 203 F.3d 800, 803-04 (Fed. Cir. 2000) (holding that a determination of the applicability of attorney-client privilege to an invention record implicates the substantive patent law of inequitable conduct). The Court therefore applies Federal Circuit law to the issue of whether MMIC may depose the patent prosecution attorneys with respect to its defense of inequitable conduct. See, e.g. , Brigham & Women's , 707 F.Supp.2d at 469 (applying the law of the Federal Circuit to the issue of waiver of attorney-client privilege); Bd. of Trustees of Leland Stanford Junior Univ. v. Roche Molecular Sys., Inc. , 237 F.R.D. 618, 623 (N.D. Cal. 2006) (same). The Court notes, however, that under the "flexible approach to lawyer depositions" endorsed by the Second Circuit, it would follow the same route in resolving the issue. In re Subpoena Issued to Dennis Friedman , 350 F.3d 65, 72 (2d Cir. 2003).
The parties agree that the subpoenas seek testimony covered by attorney-client privilege. AMoHS argues broadly that the subpoenas violate Rule 45 and that it has not waived attorney-client privilege. MMIC responds equally broadly that because it has made an inequitable conduct claim it is entitled to depose patent prosecution counsel.
The subpoena listed thirteen topics of inquiry, only three of which appear to relate to a claim of inequitable conduct before the United States Patent Office. For the remaining topics, numbered three through twelve, MMIC has not demonstrated that they have any relevance to a defense of inequitable conduct, and consequently no particular need for this information that it cannot obtain through other means of discovery. As MMIC has not offered any other justification for invading the attorney-client privilege between litigation counsel and its client, the motion to quash is granted with respect to topics three through twelve.
Topic no. 1 seeks testimony concerning "[p]rosecution and reexamination of... [the 435 patent], including any communications regarding prior art, equipment required for invasive surgery, requirements for invasive surgery, and the scope of the claims of the 435 patent." Topic no. 2 seeks testimony concerning "[r]equests during pendency of reexaminations of the 435 patent made by [DRM] regarding prior art to the 435 patent and diligence of [DRM] in collecting relevant prior art. Topic no. 13 seeks testimony concerning "[c]ollection, handling, disassembly, and production of the fax produced as AMoHS 4646-48, 4334-37, 4388-40, and 4341-49 and any missing pages of that fax." MMIC has demonstrated that these areas of inquiry relate to its defense of inequitable conduct before the United States Patent Office, and the motion to quash is therefore denied as to these topics. However during the depositions AmoHS may make specific objections to specific questions that it considers to be irrelevant to ...