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 Coastal Patent Law Group, PC, California Institute of Technology, and Law Office of Owen J. Bates.

Top cities in California

All practitioners in California

Cy J Bates

Reg. 77214

Patent attorney

Coastal Patent Law Group, PC

Oceanside, CA · 92056

858-565-4730

Gloria C. M. Bates

Reg. 84746

Patent agent

California Institute of Technology

Pasadena, CA · 91125

626-395-6811

Liana Guo Bates

Reg. 66821

Patent agent

Oak Park, CA · 91377

805-368-5655

Owen J Bates

Reg. 40346

Patent attorney

Law Office of Owen J. Bates

San Jose, CA · 95121

650-248-5974

Suzanne M Bates

Reg. 42640

Patent attorney

Pfizer, Inc.

San Diego, CA · 92121

734-622-2658

Amy E. Bathke

Reg. 79472

Patent attorney

Law Office of Amy E. Bathke

La Mesa, CA · 91941

858-337-1274

Kent B Bathurst

Reg. 51442

Patent attorney

Carr & Ferrell, LLP

San Mateo, CA · 94402

650-812-3486

Richard R Batt

Reg. 43485

Patent attorney

Batt IP

Aptos, CA · 95001

650-681-9503

Dev Batta

Reg. 67044

Patent attorney

AVEVA Software LLC

Lake Forest, CA · 92630

949-638-8213

Justin T. Battle

Reg. 82739

Patent attorney

Battle Law

Los Angeles, CA · 90017

424-625-3325

Harper S Batts

Reg. 56160

Patent attorney

Sheppard Mullin Richter & Hampton LLP

Menlo Park, CA · 94025

650-815-2673

Tiffany M Baughman

Reg. 57587

Patent attorney

Oceanside, CA · 92057

760-805-3163

John A. Baumgartner

Reg. 79510

Patent attorney

Fastly, Inc.

San Francisco, CA · 94107

844-432-7859

Rex P Bautista

Reg. 67766

Patent agent

Chula Vista, CA · 91911

619-862-5416

Nicholas Thane Bauz

Reg. 41604

Patent attorney

Bauz IP Law, LLP

La Jolla, CA · 92037

858-987-4027

Paul F Bawel

Reg. 39104

Patent attorney

Acacia Research Group LLC

New Port Beach, CA · 92660

949-480-8335

Margaret A. Baxter

Reg. 78109

Patent attorney

DLA Piper LLP

Los Angeles, CA · 90067-4735

415-971-2005

Bradley D. Bayan

Reg. 75521

Patent attorney

Redwood City, CA · 94063

650-364-3600

Derek R Bayles

Reg. 66226

Patent attorney

Knobbe Martens Olson & Bear

Irvine, CA · 92614

949-760-0404

Michelle Bazu

Reg. 69062

Patent attorney

Palo Alto, CA · 94304

650-427-5752

Linda M Beach

Reg. 36446

Patent attorney

Redwood City, CA · 94062

650-996-7496

Caleb J. Bean

Reg. 72837

Patent attorney

Manatt, Phelps & Phillips, LLP

Costa Mesa, CA · 92626

714-338-2828

Darren QX Bean

Reg. 75331

Patent attorney

Salinas Courthouse

Salinas, CA · 93901

831-775-5488

KC Bean

Reg. 50378

Patent attorney

Bean Law Office

Vista, CA · 92084

760-940-0761

William D Beard

Reg. 48888

Patent attorney

Granite Bay, CA · 95746

916-412-4061

Harper L Beasley

Reg. 81554

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

858-707-4014

Geoffrey R Beatty

Reg. 59993

Patent attorney

Beckman Coulter

Brea, CA · 92821

714-961-6328

Sergio D. Becerra

Reg. 75908

Patent agent

Santa Monica, CA · 90401

815-764-9589

Michael J Beck

Reg. 40907

Patent attorney

San Mateo, CA · 94403

650-570-6680

Kyle A. Beckemeyer

Reg. 72838

Patent attorney

Xperi

San Jose, CA · 95134

773-599-2314

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.