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 Neil Thompson, Slater Hersey & Lieberman LLP, and Thompson Technology Law.

Top cities in California

All practitioners in California

Mark W Thompson

Reg. 51119

Patent attorney

Corona, CA · 92882

909-735-1835

Neil I Thompson

Reg. 69847

Patent agent

Neil Thompson

San Diego, CA · 92105

949-292-6720

Sandra Poteat Thompson

Reg. 46264

Patent attorney

Slater Hersey & Lieberman LLP

Irvine, CA · 92612

949-398-7507

Stanley H Thompson· Jr

Reg. 45160

Patent attorney

Thompson Technology Law

Glendale, CA · 91203

323-409-9066

Jessica A. Thomson

Reg. 68876

Patent attorney

The Walt Disney Company

Burbank, CA · 91521

818-560-6821

William Edward Thomson· Jr

Reg. 20719

Patent attorney

Brooks Kushman P.C.

Los Angeles, CA · 90017

213-622-3013

Nick Alan Thornburg

Reg. 65669

Patent attorney

Oakland, CA · 94611

510-846-0035

Robert R Thornton

Reg. 19285

Patent attorney

Encinitas, CA · 92024

760-753-3183

Connie M Thousand

Reg. 43191

Patent attorney

Northrop Grumman Space and Mission Systems Corp.

Redondo Beach, CA · 90278

310-813-1550

Damon M. Thurston

Reg. 61896

Patent attorney

Rankin, Sproat, Mires, Beaty & Reynolds

Oakland, CA · 94612

510-465-3922

Paul M Thyfault

Reg. 40204

Patent agent

Pittsburg, CA · 94565

925-432-7627

Dihong Tian

Reg. 68034

Patent agent

Saratoga, CA · 95070

408-966-4865

Lei Tian

Reg. 82791

Patent agent

Irvine, CA · 92620

949-247-6086

Xuezhen Tian

Reg. 69889

Patent attorney

Davis Wright Tremaine

San Francisco, CA · 94111

415-276-4893

Zong-Qiang B. Tian

Reg. 61753

Patent agent

Morrison & Foerster, LLP

Palo Alto, CA · 94304

650-813-5752

Jerry D. Tice· II

Reg. 73582

Patent attorney

Feinberg Day Kramer Alberti Lim Tonkovich & Belloli LLP

Burlingame, CA · 94010

469-563-6458

David Michael Tichane

Reg. 37741

Patent attorney

David Tichane

Fair Oaks, CA · 95628

408-368-1759

Nicholas S Tiee

Reg. 77907

Patent agent

Wilson, Sonsini, Goodrich and Rosati

San Francisco, CA · 94107

650-849-3327

Hannah M Tien

Reg. 71705

Patent attorney

Monterey Park, CA · 91755

424-305-9204

Vincent J Tien

Reg. 78086

Patent attorney

Santa Ana, CA · 92705

714-544-8436

Tuan V. Tiet

Reg. 78317

Patent attorney

Hillsbourough, CA · 94010

415-250-7979

Steven Charles Tietsworth

Reg. 59855

Patent attorney

SeeScan, Inc.

San Diego, CA · 92123-1813

858-244-5939

Thomas J Tighe

Reg. 29451

Patent attorney

San Diego, CA · 92192-2900

858-450-1881

Anup Tikku

Reg. 42185

Patent attorney

San Jose, CA · 95131

408-967-7174

Bond-Yen Ting

Reg. 62896

Patent agent

San Jose, CA · 95129

408-996-8583

Elizabeth C Tingen

Reg. 77185

Patent agent

Macdonald & Cody, LLP

Irvine, CA · 92614

714-644-8611

Stephanie J. Tinsley

Reg. 72621

Patent attorney

Kyocera International Inc.

San Diego, CA · 92123

858-882-1980

John E Tinsman

Reg. 73427

Patent agent

Kudelski Group

Mountain View, CA · 94043

650-962-5000

Eric J. Tisdale

Reg. 60110

Patent agent

Rutan & Tucker LLP

Costa Mesa, CA · 92626-1931

714-338-1849

Lauren C. Tittle

Reg. 81229

Patent attorney

Snell & Wilmer

Costa Mesa, CA · 92626

714-427-7437

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.