California

Patent attorneys in California

California hosts 9,567 active patent practitioners registered with the USPTO Office of Enrollment and Discipline. Patent attorneys and patent agents can both prepare and file patent applications, but only patent attorneys can also offer legal advice on prosecution strategy, freedom-to-operate analyses, and infringement opinions in California. Practitioners are concentrated across 20 cities, with the largest clusters in the metros listed below. Notable firms with multiple registered practitioners in the state include Knobbe Martens Olson & Bear, LLP, University of San Francisco School of Law, and Aura IP Law, PC.

Top cities in California

All practitioners in California

Sheila R Gibson

Reg. 54120

Patent attorney

Aura IP Law, PC

Lakewood, CA · 90712

562-380-2872

Virginia L Giddings

Reg. 45902

Patent agent

Alza

Mountain View, CA · 94040

650-564-5028

Jeffery C Giering

Reg. 68221

Patent attorney

Greenberg Traurig, LLP

San Diego, CA · 92130

619-848-2514

Brooks Gifford· III

Reg. 58929

Patent attorney

Brooks Gifford III

Solana Beach, CA · 92075

619-884-6249

Christina N Gifford

Reg. 44122

Patent attorney

Amgen

Thousand Oaks, CA · 91320

805-447-2797

Nicholas S Gikkas

Reg. 46245

Patent attorney

THE GIKKAS LAW FIRM, P.C.

MOUNTAIN VIEW, CA · 94040

650-815-7085

Anna Gil

Reg. 46726

Patent attorney

Genentech

South San Francisco, CA · 94080-4990

650-225-1571

Adam J Gilbert

Reg. 59967

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Lawrence Gilbert

Reg. 25242

Patent attorney

California Institute of Technology

Pasadena, CA · 91125

626-395-3288

Jeffrey Edward Gilbo

Reg. 77938

Patent agent

The Gilbo Law Group

GLENDALE, CA · 91208

747-255-7385

David R Gildea

Reg. 38465

Patent agent

Menlo Patent Agcy LLC

Menlo Park, CA · 94025

650-853-0189

Robert W Giles

Reg. 54122

Patent attorney

Qualcomm, Inc.

San Diego, CA · 92121

858-658-4719

Angus R Gill

Reg. 51133

Patent agent

Orrick, Herrington & Sutcliffe LLP

Menlo Park, CA · 94025

650-614-7400

Eric K. Gill

Reg. 71709

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

San Diego, CA · 92130

858-720-8900

Sanjivpal S Gill

Reg. 42578

Patent attorney

Xperi

San Jose, CA · 95134

408-321-6012

William D Gill

Reg. 44124

Patent agent

IBM Corporation

San Jose, CA · 95193

408-256-2821

Jeremy Stephen Gillespie

Reg. 902995

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

415-302-5779

Noel C Gillespie

Reg. 47596

Patent agent

Buchalter

San Diego, CA · 92101-8494

619-787-6668

Justin J Gillett

Reg. 71099

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Paul A Gillette

Reg. 56360

Patent attorney

Farjami & Farjami LLP

Mission Viejo, CA · 92691

949-282-1000

Ian W. Gillies

Reg. 62280

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

858-707-4000

Harold E Gillmann

Reg. 25336

Patent attorney

Woodland Hills, CA · 91367

818-400-2360

Michael J Gilly

Reg. 42579

Patent agent

GEN-PROBE INCORPORATED

San Diego, CA · 92121

858-410-7866

Jerry Davis Gilmer

Reg. 44711

Patent attorney

San Jose, CA · 95125

408-608-9054

John O Gilmore

Reg. 46375

Patent attorney

Palo Alto, CA · 94301

650-323-6620

Gideon Gimlan

Reg. 31955

Patent attorney

Los Gatos, CA · 95032

408-315-1026

Francis O Ginah

Reg. 44712

Patent attorney

Gilead Sciences, Inc.

Foster City, CA · 94404

650-372-7942

Karisa Joy Gingerich

Reg. 901820

Limited recognition

University of San Francisco School of Law

San Francisco, CA · 94117-1080

514-214-5411

Brenden S Gingrich

Reg. 60295

Patent attorney

Knobbe, Martens, Olsen & Bear LLP

San Diego, CA · 92130

858-707-4000

Cole Robert Gingrich

Reg. 79228

Patent attorney

YHE Law LLP

Lafayette, CA · 94549

141-561-29954

Common questions

Do I need a patent attorney based in California?

No. Every USPTO-registered patent practitioner is licensed to file applications on behalf of inventors in any state, regardless of where the practitioner's office is. Choosing a California-based practitioner can simplify in-person inventor signings, local meetings, and same-time-zone calls, but it is not a legal requirement.

How many patent attorneys are licensed in California?

9,567 active USPTO-registered patent practitioners list a California office address on the OEDCI roster. This includes both patent attorneys (who can also offer legal advice) and patent agents (who can prepare and file patents but not offer broader legal advice).

What is the difference between a patent attorney and a patent agent?

Both pass the USPTO Patent Bar and can prepare, file, and prosecute patent applications. Only patent attorneys also hold a state bar license, meaning they can additionally offer legal advice on infringement, licensing, and litigation strategy. Patent agents tend to charge less per hour and are common at large in-house IP departments.