C.D. Cal.

C.D. Cal. — Patent Litigation Practice Profile

Court overview. The United States District Court for the Central District of California (C.D. Cal.) sits in the Ninth Circuit with divisions in Los Angeles (Western), Santa Ana (Southern), and Riverside (Eastern). It is the nation's largest district court by population and one of the busiest IP venues. Historically a top-tier patent forum — it ranked No. 1 in patent filings around 2009–2010 (Milbank/Daily Journal, citing Administrative Office data) — its relative share has since slipped: Unified Patents' 2025 mid-year report places E.D. Tex., W.D. Tex., D. Del., N.D. Ill., and D.N.J. ahead of it, though C.D. Cal. still receives hundreds of patent filings annually.

Docket reputation. C.D. Cal. is not a "rocket docket." Docket Navigator data (Jan. 2022–Aug. 2025, filed as an exhibit in IPR2025-01272) shows an average of 39 months and median of 35 months from filing to trial. Older academic data painted a mixed picture: a Chicago-Kent study found C.D. Cal. claim-construction rulings were reversed/vacated/remanded 46.3% of the time (2000–2008), the highest among the top 13 patent districts, and a University of Illinois study found only 41% of its patent rulings fully affirmed — both figures dating to before the Patent Pilot Program. No recent, well-sourced statistics on transfer-grant rates were located; anecdotally, the district's heavy concentration of technology, medical-device, and consumer-product companies means many cases have genuine local nexus.

Local rules and procedures. The district has no district-wide local patent rules; instead, individual judges issue standing patent orders, many modeled on the N.D. Cal. Patent Local Rules (e.g., infringement/validity contentions, claim-term exchanges, Markman briefing), including Judge John A. Kronstadt's "Initial Standing Order for Patent Cases" and similar orders by Judges Andrew Guilford and Josephine Staton (Catholic Univ. J. of Law & Tech. 2025). The defining feature is the Patent Pilot Program, launched in 2011 and made permanent on July 5, 2021, under which six district judges (plus designated magistrate judges) staff a patent assignment wheel. Per the court's FY2021 annual report, 72% of patent cases were assigned or transferred to program judges that year.

Notable cases. The tracked case, Context Directions LLC v. Garmin International, Inc. (2:22-cv-01360), filed Feb. 28, 2022, illustrates the program's reassignment mechanics: initially drawn to Judge John F. Walter, it was promptly transferred to Patent Program Judge Mark C. Scarsi (with Magistrate Judge Maria A. Audero as referral judge). The NPE suit (Stanford NPE Litigation Database) ended in a stipulated dismissal with prejudice within roughly three months. Other dockets, such as Core Optical Technologies LLC v. Cisco Systems, Inc., reflect routine application of program judges' standing patent orders.

Judges. Reliably sourced patent-program district judges include Mark C. Scarsi (presiding judge on the tracked case), John A. Kronstadt, James V. Selna, George H. Wu, and John W. Holcomb (FBA-LA judicial panel, Jan. 2023; Alston & Bird summary); Magistrate Judge Michael R. Wilner is a prominent patent-program magistrate. No published Lex Machina/Unified Patents analysis characterizing individual C.D. Cal. judges as plaintiff- or defendant-friendly was found, so none is offered here.