Russ August & Kabat

Firm: Russ August & Kabat
Date: 2026-05-02

Patent Litigation Summary

Russ August & Kabat is a Los Angeles-based litigation boutique known for its formidable patent trial practice. With over 50 attorneys, the firm is not an AmLaw-ranked "BigLaw" firm but is recognized as a top-tier IP and patent litigation specialty firm. U.S. News - Best Lawyers has repeatedly given the firm a Metropolitan Tier 1 ranking for Litigation in both Intellectual Property and Patents in Los Angeles. The patent litigation group was launched in 2003 by Marc A. Fenster and has since developed a national reputation.

The firm's practice is heavily weighted towards representing patent holders in high-stakes enforcement actions. The tracked case data shows a plaintiff-side appearance for Intent IQ LLC, and the firm's website touts significant victories for patent owners against major technology companies. This focus extends to its work before the Patent Trial and Appeal Board (PTAB), where one report noted the firm was among the most active, representing patent owners in over 99% of its 201 PTAB cases over a recent three-year period. While they have represented defendants, their public profile is most closely associated with prosecuting infringement claims for patent holders.

Russ August & Kabat's litigators handle cases across a wide spectrum of complex technologies, including semiconductors, mobile communications, data encryption, medical devices, and software. The firm has secured a string of noteworthy plaintiff-side jury verdicts, including a $175 million verdict for Headwater Research against Verizon in 2025 and a separate $279 million verdict for the same client against Samsung. In the tracked matter, Intent IQ LLC v. Viant Technology LLC, the firm is representing the patent holder in a case involving digital advertising technology.

The practice is led by prominent trial lawyers, including Marc A. Fenster, who heads the patent litigation group, and partners Reza Mirzaie and Philip X. Wang, all of whom are named in the Intent IQ case. The firm's litigation roster includes numerous attorneys with technical degrees in fields such as electrical engineering and computer science, who handle matters in federal district courts, the International Trade Commission (ITC), and the PTAB.