Dontzin Nagy & Fleissig

Let me verify the firm's own practice description and case outcomes.

Dontzin Nagy & Fleissig LLP — Patent Litigation Practice Summary

Firm overview. Dontzin Nagy & Fleissig LLP is a New York City litigation boutique, founded in 1993 (originally The Dontzin Law Firm) and headquartered in Manhattan (currently 31 East 62nd Street, previously 980 Madison Avenue). It is a single-office shop, not a BigLaw firm or a specialist IP boutique: the U.S. News firm profile lists 15 lawyers and 6 partners, and PitchBook describes it as a boutique litigation and corporate firm. I could not verify any AmLaw or Chambers ranking for the firm in the sources reviewed, so no ranking claim is made here. Its self-description emphasizes high-stakes commercial disputes for banks, hedge funds, asset managers, art-world clients, and high-net-worth individuals, with IP listed as one of several practice areas alongside white collar, banking/financial services, and art law.

IP litigation specialty. Patent work is a secondary but real component of a general commercial-litigation platform rather than a standalone patent practice. The firm's verified patent docket is concentrated in computer/network technology: the Intellectual Ventures II v. JPMorgan Chase matter involved patents on network-based intrusion detection, anomaly detection, data encryption and "crypto-engine" co-processors, and digital-content access control (U.S. Patents 6,715,084; 6,314,409; 5,745,574; 6,826,694; and 7,634,666) — i.e., software and computer-security subject matter litigated in the wake of Alice. Beyond that, its publicly reported IP work includes copyright and trademark matters, including defense of Gagosian Gallery in a copyright suit and representation of blockchain company ConsenSys in an IP case brought by BlockCrushr. There is no evidence in the sources reviewed of pharma, semiconductor, or standards-essential/Wi-Fi patent experience.

Side preference. The firm's tracked patent litigation record is entirely defendant-side: 4 of 4 tracked appearances are on the defense side, with 0 plaintiff-side appearances, and it acted as local counsel in the JPMorgan matters defending an operating bank against an assertion entity (Intellectual Ventures II). That said, this reflects the patent docket specifically, not the firm's overall posture — its attorneys publicly describe representing both plaintiffs and defendants in commercial litigation (e.g., it represents Sphere 3D as plaintiff in a non-patent contract case), and founding partner Tibor Nagy has been profiled as handling both sides of high-stakes IP and commercial disputes. Deposition-side data should be read as "defense-oriented in patent cases," not as an NPE/PAE plaintiff firm.

Notable patent cases and outcomes. The anchor matter is Intellectual Ventures II LLC v. JPMorgan Chase & Co., No. 13-cv-3777 (AKH) (S.D.N.Y.). Dontzin Nagy & Fleissig served as local counsel alongside lead counsel Durie Tangri and Kirkland & Ellis; firm attorneys Tibor Nagy and Stephanie Suarez argued claim construction before Judge Alvin Hellerstein. In an April 29, 2015 ruling, the court granted JPMorgan summary judgment of invalidity under 35 U.S.C. §101, invalidating asserted IV patents as directed to patent-ineligible abstract ideas — reported by Law.com as a ruling in favor of the defense teams. The JPMC court's partial summary judgment order holding the '084 patent invalid later supported collateral estoppel in Intellectual Ventures II LLC v. Capital One (Fed. Cir. No. 16-1077, 2017), which affirmed invalidity of that patent; the firm was not identified as appellate counsel there. The related docketed matter J.P. Morgan Chase & Co. v. Intellectual Ventures II LLC appears to be a parallel declaratory-judgment action in which the firm again acted as local counsel. Two additional tracked appearances are recorded without case names in the underlying data and could not be independently verified; they are attributed to Matthew S. Dontzin as lead trial counsel and local counsel, respectively.

PTAB / IPR practice. The firm's PTAB footprint is modest and appears derivative of the JPMorgan defense rather than a stand-alone post-grant practice. The 2013 JPMorgan litigation generated a covered business method review (CBM2014-00157, on the '409 patent, decided orally in August 2015) and IPR petitions on the same patent (IPR2014-00672 and -00673); Dontzin Nagy attorneys signed filings and claim-construction correspondence in those proceedings, working with Kirkland & Ellis lawyers who argued the Board hearings. There is no public report indicating a large or independent IPR/PGR filing volume for the firm; any claim of significant PTAB scale would be unsupported. Note also that the Federal Circuit's 2015 decision dismissing JPMorgan's interlocutory stay appeal (Intellectual Ventures II v. JPMorgan Chase, No. 14-1724) arose from this litigation, though the appeal addressed a CBM stay dispute rather than substantive patentability.

Key partners / practice leaders. Tibor L. Nagy, Jr. is the firm's most visible IP-litigation figure — founding partner, lead Dontzin lawyer on the IV/JPMorgan matters, counsel of record in the related PTAB filings, and profiled by Crain's New York Business for IP work including the ConsenSys defense (he is the only attorney in the tracked data appearing across all four patent-related entries, alongside associate-level coverage by Stephanie M. Suarez). Matthew Seldin Dontzin is the founding partner and named local/lead counsel in the tracked JPMorgan entries, though his public profile centers on commercial, art, and white-collar litigation. David A. Fleissig appears on IP/copyright matters (including the Gagosian representation), and Tracy O. Appleton is listed with appellate and litigation responsibilities. The firm website was not retrievable in this research; partner descriptions here are drawn from court filings, U.S. News/Lawdragon profiles, and press coverage rather than a firm-authored practice page.