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 Morrison & Foerster LLP, Quantcast Corporation, and Soquel Group.

Top cities in California

All practitioners in California

Michael R Blum

Reg. 44543

Patent attorney

Quantcast Corporation

San Francisco, CA · 94103

415-738-4755

Robert E. Blumberg

Reg. 66808

Patent agent

Soquel Group

Santa Cruz, CA · 95060

831-426-8200

Bryan A Blumenkopf

Reg. 73282

Patent attorney

Morrison & Foerster LLP

San Diego, CA · 92130-2040

213-892-5269

Mark Blumenkrantz

Reg. 40915

Patent agent

The Boeing Company

Seal Beach, CA · 90740

562-797-3649

David A Blumenthal

Reg. 26257

Patent attorney

Morrison & Foerster LLP

Los Angeles, CA · 90017

213-892-5200

Andrew P Blythe

Reg. 75014

Patent attorney

Gibson, Dunn & Crutcher

Irvine, CA · 92612-4412

949-451-3926

Arthur J Bobel

Reg. 69031

Patent attorney

Leydig, Voit & Mayer, LLP

Walnut Creek, CA · 94596-5083

925-482-0100

Marc P Bobys

Reg. 45267

Patent attorney

Los Angeles, CA · 90049

+65-910-88004

Breton A Bocchieri

Reg. 31739

Patent attorney

Novak, Druce, Connolly, Bove & Quigg, LLP

Los Angeles, CA · 90071

213-787-2500

Madison Sirena Bockus

Reg. 902900

Limited recognition

University of California, Los Angeles School of Law

Los Angeles, CA · 90095-1476

Barbara Ann Boczar

Reg. 41623

Patent attorney

University Of California, Davis

Davis, CA · 95616

530--75-4-8606

William W Bodnar

Reg. 51479

Patent attorney

Law Offices of William Bodnar

Chico, CA · 95926

530-899-7092

Adrienne L. Boerger

Reg. 66192

Patent agent

Cepheid

Sunnyvale, CA · 94089

408-548-9155

Christian D. Boettcher

Reg. 80009

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92626

714-236-0444

Evan E. Boetticher

Reg. 63184

Patent agent

Lewis Roca Rothgerber Christie LLP

San Francisco, CA · 94111

650-687-8435

Keith R Bogdon

Reg. 46562

Patent agent

Coalesce Corporation

Mill Valley, CA · 94941

415-384-3042

Gregory Z. Boger

Reg. 68874

Patent attorney

Procopio, Cory, Hargreaves & Savitch LLP

Irvine, CA · 92618

949-247-7319

J L Bohan

Reg. 20183

Patent attorney

San Jose, CA · 95132

408-209-4639

Patrick T Bohan

Reg. 82293

Patent agent

Chevron Oronite

Richmond, CA · 94801

510-242-5736

Hal Jay Bohner

Reg. 27856

Patent attorney

Law Office Of Hal Bohner

Pacifica, CA · 94044

650-359-4257

Kamil S Bojanczyk

Reg. 74176

Patent agent

Grid Tech IP

Santa Clara, CA · 14850

607-279-8822

Raazia W Bokhari

Reg. 62141

Patent attorney

Law Offices of Raazia Bokhari

Santa Ana, CA · 92701

714-550-9380

Michael J Bolan

Reg. 42339

Patent agent

Vista IP Law Group LLP

Irvine, CA · 92614

Jennifer C. Boles

Reg. 84528

Patent agent

San Diego, CA · 92108

480-241-5865

Douglas G Bolesch

Reg. 56796

Patent attorney

Proskauer Rose LLP

Los Angeles, CA · 90067

310-284-5627

Kimberly A Bolin

Reg. 44546

Patent agent

Cooley LLP

Palo Alto, CA · 94304-1130

650-543-5000

Pamela L Boling

Reg. 70161

Patent attorney

Santa Rosa, CA · 95404

925-321-4463

William C Boling

Reg. 41625

Patent attorney

Boling Patents

San Diego, CA · 92120-1812

619-583-9956

Brooke S. Boll

Reg. 76268

Patent attorney

Sidley Austin, LLP

Los Angeles, CA · 90071

213-896-6633

Jeffrey R. Bolland

Reg. 73759

Patent agent

10x Genomics

Pleasanton, CA · 94588

205-470-6077

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.