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 Daria, Klintworth & Rozenblat IP LLP, and Brown & Winters.

Top cities in California

All practitioners in California

Wendy L Boss

Reg. 56852

Patent agent

Hillsborough, CA · 94010

650-646-8715

Dan C Bostan

Reg. 62696

Patent agent

Daria

Modesto, CA · 95356

209-518-3248

Herb Boswell

Reg. 27311

Patent agent

Dunlap, CA · 93621

559-338-2805

Michael K Bosworth

Reg. 28186

Patent attorney

Klintworth & Rozenblat IP LLP

San Jose, CA · 95128

408-827-3303

Wentzelee Botha

Reg. 48902

Patent attorney

Brown & Winters

Cardiff by the Sea, CA · 92007

760-633-4485

Darci K. Botsch

Reg. 84203

Patent agent

Kirkland & Ellis LLP

San Francisco, CA · 94104

415-439-1911

Matthew D. Bottomly

Reg. 66306

Patent agent

Orangevale, CA · 95662

703-975-4160

James L S Bouldin

Reg. 42351

Patent attorney

SABA Software, Inc.

Redwood Shores, CA · 94065

650-581-2500

Michael H Bourdaa

Reg. 63050

Patent attorney

Downey, CA · 90241

562-622-0820

Alexandra A. Bouza

Reg. 79709

Patent agent

Foley & Lardner LLP

San Diego, CA · 92130

248-410-6384

Louis J Bovasso

Reg. 24075

Patent attorney

Malibu, CA · 90265

310-457-9919

Lesley Coulson Boveri

Reg. 46642

Patent agent

Phoenix Technologies Ltd

Milpitas, CA · 95035

408-891-9461

Tyler R Bowen

Reg. 78562

Patent attorney

San Francisco, CA · 94109

571-839-9549

William D. Bowen

Reg. 73010

Patent attorney

Law Offices of William D. Bowen

Hacienda Heights, CA · 91745

213-761-4332

Carl A. Bowers

Reg. 69365

Patent attorney

Lyft, Inc.

San Francisco, CA · 94107

415-935-3760

Steven Andrew Bowers

Reg. 48235

Patent attorney

Oak Park, CA · 91377

202-669-2397

Graham R Bowles

Reg. 73890

Patent agent

Rutan & Tucker, LLP

Costa Mesa, CA · 92626

714-338-1817

Christopher C Bowley

Reg. 55016

Patent attorney

Fish & Richardson P.C.

Redwood City, CA · 94063

650-839-5001

David B Bowls

Reg. 39915

Patent agent

Costa Mesa, CA · 92627

949-331-6881

David Ross Bowman

Reg. 44039

Patent attorney

Palo Alto, CA · 94303

650-605-5470

Donald Larry Bowman

Reg. 46432

Patent attorney

Cotati, CA · 94931

410-419-7804

Jill Hubbard Bowman

Reg. 51490

Patent attorney

Santa Clara, CA · 95054

408-765-3829

Brian P. Boyce

Reg. 83823

Patent agent

Calabasas, CA · 91302

310-650-0711

Justin F Boyce

Reg. 40920

Patent attorney

Dechert LLP

Mountain View, CA · 94040

650-813-4900

Kristina Marie Boyce

Reg. L3657

Limited recognition

Lincoln Law School of San Jose

San Jose, CA · 95113

408-977-7227

Brent Adam Boyd

Reg. 51020

Patent attorney

San Diego, CA · 92109

858-245-8361

Victoria L Boyd

Reg. 43510

Patent attorney

Adverum Biotechnologies, Inc.

Redwood City, CA · 94063

408-667-6761

William Eric Boyd

Reg. 43509

Patent attorney

Ostendo Technologies, Inc.

La Mesa, CA · 91941

949-413-1666

Brian S Boyer

Reg. 52643

Patent attorney

Syndicated Law PC

Redwood City, CA · 94063

650-556-1945

Bryan J Boyle

Reg. 52644

Patent attorney

Alkahest, Inc.

San Carlos, CA · 94070

650-801-0489

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.