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 Bachmann Law Group, Baker Botts LLP, and Greenberg Traurig LLP.

Top cities in California

All practitioners in California

Matthew B. Avery

Reg. 61127

Patent attorney

Baker Botts LLP

San Francisco, CA · 94111

415-291-6224

Emir E. Aviles Pagan

Reg. 79453

Patent agent

Greenberg Traurig LLP

San Francisco, CA · 94105

415-655-1300

Adam Avrunin

Reg. 45457

Patent attorney

San Francisco, CA · 94105

415-867-5309

Babak Ayazifar

Reg. 56793

Patent agent

Berkeley, CA · 94712-2185

510-898-2950

Michael B Ayers

Reg. 44015

Patent attorney

Verance Corp.

San Diego, CA · 92121

858-202-2836

Aram Ayrapetian

Reg. 64833

Patent attorney

Novum Patent Services

San Francisco, CA · 94110

310-339-3295

Edward J Baba

Reg. 52581

Patent attorney

Bozlcevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Tatsuo Baba

Reg. 58090

Patent agent

Foothill Ranch, CA · 92610

949-597-0628

William T Babbitt

Reg. 39591

Patent attorney

Lecch Tishman Fuscaldo & Lampl

El Segundo, CA · 90245

424-738-4000

Brenton R Babcock

Reg. 39592

Patent attorney

Womble Bond Dickinson LLP

Irvine, CA · 92618

714-557-3800

Lois C Babcock

Reg. 30947

Patent agent

Santa Maria, CA · 93456

805-219-0015

Jacob Binh-Nguyen Bach

Reg. 54335

Patent attorney

Aci Law Group

La Palma, CA · 90623

714-522-3300

Joseph Bach

Reg. 37771

Patent attorney

Womble Bond Dickinson (US) LLP

Palo Alto, CA · 94303

408-341-3059

Edward N Bachand

Reg. 37085

Patent attorney

Intellectual Innovations Legal Advisors

Menlo Park, CA · 94026-0430

650-458-5517

Jonathan E Bachand

Reg. 67884

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

202-640-6400

Stephanie L Bachmann

Reg. 65801

Patent agent

Bachmann Law Group

Cupertino, CA · 95014

408-725-7520

Stephen R Bachmann

Reg. 50806

Patent attorney

Bachmann Law Group

Cupertino, CA · 95014

408-725-7520

Brett E. Bachtell

Reg. 63961

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121-1714

858-658-5018

Kenneth R Backus

Reg. 48861

Patent attorney

Kokka & Backus, PC

Palo Alto, CA · 94301

650-566-9919

Kirk D Bacon

Reg. 72708

Patent attorney

Westminster, CA · 92683

714-458-0100

Steven G. Bacsi

Reg. 50736

Patent attorney

Zymergen, Inc.

Emeryville, CA · 94608

650-450-2141

Annette L Bade

Reg. 37029

Patent attorney

The Boeing Company

Huntington Beach, CA · 92647

562-344-7800

Martin R Bader

Reg. 54736

Patent attorney

Sheppard Mullin Richter Hampton LLP

San Diego, CA · 92130

858-720-7446

Leslie Badin· Jr

Reg. 29509

Patent attorney

Tustin, CA · 92782

949-285-1320

Saksham Badyal

Reg. 84300

Patent agent

Palo Alto, CA · 94304

650-843-4000

Bong Kook Bae

Reg. 76382

Patent agent

San Diego, CA · 92130

858-230-0743

Jae Yeon Baek

Reg. 78258

Patent attorney

Fenwick & West LLP

Mountain View, CA · 94041

650-335-7142

Joshua Y. Baek

Reg. 71028

Patent agent

Fullerton, CA · 92833

909-456-0570

Juerg W Baenziger

Reg. 50339

Patent agent

Walnut Creek, CA · 94596

510-517-5766

Sanjay S Bagade

Reg. 42280

Patent attorney

Levine Bagade Han LLP

Palo Alto, CA · 94303

650-242-4210

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.