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 Arnold & Porter Scholer, Qualcomm, Inc, and Nicholson De Vos Webster & Elliott LLP.

Top cities in California

All practitioners in California

Ali R Haghighi

Reg. 74990

Patent attorney

Arnold & Porter Scholer

Los Angeles, CA · 90017

213-243-4260

James Ttrett Hagler

Reg. 40631

Patent attorney

Qualcomm, Inc

San Diego, CA · 92121

858-651-0266

Mark T. Hagler

Reg. 80238

Patent attorney

Nicholson De Vos Webster & Elliott LLP

San Jose, CA · 95113

408-684-6383

Brian T Hahn

Reg. 69069

Patent attorney

Weaver Austin Villeneuve & Sampson, LLP

Oakland, CA · 94607

510-663-1100

Douglas Q Hahn

Reg. 47626

Patent attorney

Stradling, Yocca Carlson & Rauth

Newport Beach, CA · 92660

949-725-4138

Kirk Otto Hahn

Reg. 51763

Patent agent

Santa Ana, CA · 92705

714-544-2934

Peter K Hahn

Reg. 34833

Patent attorney

Pillsbury, Winthrop, Shaw, Pittman, LLP

San Diego, CA · 92101

619-544-3108

Sujung Hahn

Reg. 80302

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Menlo, CA · 94025-4111

650-815-2632

Lisa A Haile

Reg. 38347

Patent attorney

DLA Piper Rudnick Gray Cary US, LLP

San Diego, CA · 92122

858-677-1456

Kendra L. Hailey

Reg. 84023

Patent agent

San Diego, CA · 92176

858-405-7291

Bryan A. Haines

Reg. 74400

Patent agent

Burlingame, CA · 94010

808-384-0276

Dennis P Haist

Reg. 55240

Patent attorney

Lafayette, CA · 94549

925-878-1471

Brigitte A Hajos

Reg. 50971

Patent agent

Thermo Fisher Scientific

South San Francisco, CA · 94080

650-266-4739

Richard A Hake

Reg. 37343

Patent attorney

Rich Hake Consulting

Poway, CA · 92064

858-675-1163

Souad Hakim

Reg. 71009

Patent agent

Pillsbury Winthrop Shaw Pittman, LLP

San Diego, CA · 92130-4088

858-509-4006

Ahmad Hakim-Elahi

Reg. 42620

Patent attorney

University Of California, Davis

Davis, CA · 95618

530-754-7687

Michael J Halbert

Reg. 40633

Patent attorney

Paradice & Li LLP

Campbell, CA · 95011

408-275-2455

Alan T Hale

Reg. 68226

Patent attorney

Chang & Hale LLP

Irvine, CA · 92612-4694

949-336-1454

Fred T Hale

Reg. 70254

Patent agent

Knobbe, Martens, Olson and Bear, LLP

San Diego, CA · 92130

858-707-4254

Kelly H Hale

Reg. 36542

Patent attorney

Dana Point, CA · 92629

949-300-8856

Peter Wayne Hale

Reg. 51765

Patent attorney

Orrick Herrington and Sutcliffe LLP

Menlo Park, CA · 94025

650-614-7639

M. Todd Hales

Reg. 60472

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92626-7653

714-830-0514

Gregory J. Haley

Reg. 73717

Patent agent

San Diego, CA · 92130

858-775-5579

Emily M Haliday

Reg. 38903

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94607

510-663-1100

Christopher M Hall

Reg. 62908

Patent agent

Womble Bond Dickinson US

Palo Alto, CA · 94304

408-341-3051

David Alan Hall

Reg. 32233

Patent attorney

KILPATRICK TOWNSEND & STOCKTON, LLP

San Diego, CA · 92130

858-350-6100

Elise Annika Margaret Hall

Reg. 79230

Patent agent

Santa Cruz, CA · 95060

Garrett M Hall

Reg. 67888

Patent attorney

Schwegman, Lundberg, & Woessner

San Jose, CA · 95113

408-679-0850

James M Hall

Reg. 41813

Patent attorney

Palo Alto, CA · 94306

650-847-5314

Jeffrey Anson Hall

Reg. 32570

Patent attorney

Santa Cruz, CA · 95062

831-423-1365

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.