California

Patent attorneys in California

California hosts 9,553 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 Thermo Fisher Scientific, Rich Hake Consulting, and Pillsbury Winthrop Shaw Pittman, LLP.

Top cities in California

All practitioners in California

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

John J Hall

Reg. 17961

Patent attorney

Law Office of John Joseph Hall

Los Angeles, CA · 90026-5710

213-250-1145

Kathleen S Hall

Reg. 44143

Patent agent

Placerville, CA · 95667

530-626-6753

Laura E. Hall

Reg. 65157

Patent attorney

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-721-7686

Robert C Hall

Reg. 39209

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

650-225-8203

Stephen F Hallberg

Reg. 64481

Patent agent

South Pasadena, CA · 91030

310-425-3716

John L Haller

Reg. 27795

Patent attorney

Gordon & Rees, LLP

San Diego, CA · 92101

619-230-7451

Jonathan W Hallman

Reg. 42622

Patent attorney

Haynes and Boone, LLP

Costa Mesa, CA · 92626

949-202-3000

Jeffery L Hallstrom

Reg. 63934

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Genevieve M Halpenny

Reg. 75357

Patent attorney

Procopio, Cory, Hargreaves & Savitch LLP

San Diego, CA · 92130

858-480-8233

Brett Lawrence Halperin

Reg. 46478

Patent attorney

The Boeing Company

Irvine, CA · 92618

949-790-1316

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?

9,553 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.