Patrick D. McPherson

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Patrick D. McPherson — Duane Morris LLP (Washington, D.C.)

Focus areas. McPherson is a patent litigator and the managing partner of Duane Morris's Washington, D.C. office, where he also heads the firm's PTAB and inter partes review practice groups. His technology mix is heavily electronics- and communications-oriented: telecommunications and wireless (including the Wi-Fi RF front-end module dispute between Kangxi Communication Technologies and Skyworks), semiconductors, computer software, data processing/analytics, mobile geolocation, and financial-services/transaction software. He also handles life-sciences and diagnostics work (the Fujirebio–Quanterix immunoassay/tau-protein dispute) and maintains an active trademark, TTAB and copyright practice alongside the patent work.

Side of the table. The tracked docket reads 6 plaintiff / 2 defendant, but that split needs context: most of the "plaintiff" appearances are declaratory-judgment actions for non-infringement brought by accused product makers (Fujirebio) and IPR petitions filed by challengers, rather than classic patent-owner enforcement by NPEs/PAEs. On the merits he works predominantly for operating companies and patent challengers — representing Cisco as accused infringer and IPR petitioner in the Centripetal litigation, Kangxi as the accused infringer facing Skyworks (also acting as petitioner's counsel in related IPRs), and repeat petitioner-side work for Unified Patents. There is no discernible pattern of representing PAEs/NPEs as asserting plaintiffs; the plaintiff-side counts reflect DJ/IPR posture, and his reported verdict wins are defense-side as well as one plaintiff-side financial-transaction verdict.

Notable matters. Centripetal Networks v. Cisco (E.D. Va.) is the marquee matter: the district court's ~$2.75 billion enhanced-damages judgment for Centripetal was vacated by the Federal Circuit in 2022 on judicial-recusal grounds (28 U.S.C. § 455(b)(4)); McPherson is tracked as of counsel on Cisco's defense team, and his firm-bio matters include serving as lead counsel on Cisco's IPR petitions against Centripetal's asserted patents. He also appeared for Cisco — not Centripetal — in the 2026 Federal Circuit appeal (No. 24-2097), in which the court rejected Centripetal's infringement arguments on the '193 and '806 patents. Firm-reported results credited to him include a no-inducement jury verdict defeating a $300 million claim over semiconductor process patents in the E.D.N.Y., summary judgment of non-infringement in a Delaware semiconductor case, a Federal Circuit affirmance of a non-infringement summary judgment out of the N.D. Ga., and a plaintiff's jury verdict in the E.D. Tex. on secure financial-transaction technology (reported as one of Texas's top verdicts in 2012). In the Skyworks–Kangxi dispute, the ITC issued a January 2026 initial determination of no infringement and terminated the investigation in April 2026 after Skyworks withdrew its claims; firm materials credit a team led by Timothy Shannon and Li Zheng, with McPherson appearing as back-up counsel in the related district court cases, so his individual role in the ITC phase is not independently documented.

PTAB/IPR. This is a core part of his practice rather than a sideline — he has prepared and filed more than 70 IPR and CBM petitions, and his firm bio highlights Unified Patents v. SynKloud Technologies (IPR2019-01655), where all challenged claims were held unpatentable as obvious. He was lead counsel for petitioner Fujirebio in IPR2025-01060 against Quanterix's '092 patent, which terminated in October 2025 after the Board denied institution.

Bar/education. Admitted in Maryland (1995), registered to practice before the USPTO (Reg. No. 46,255) and admitted to the U.S. Court of Appeals for the Federal Circuit; not admitted in D.C. U.S. Naval Academy, B.S., 1985; Catholic University of America, Columbus School of Law, J.D., 1995. Before law practice he was a U.S. Navy nuclear submarine officer (1985–1992), and he joined Duane Morris in 2002 after time at Carter, Ledyard & Milburn and Rogers & Killeen.