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 Orrick, Herrington & Sutcliffe LLP, Abbott Diabetes Care, Inc., and Hewlett-Packard Company.

Top cities in California

All practitioners in California

Susan C Tall

Reg. 52272

Patent attorney

Abbott Diabetes Care, Inc.

Alameda, CA · 94502

510-749-5400

Sam Talpalatsky

Reg. 35380

Patent attorney

San Diego, CA · 92130

858-229-7743

Gargi Talukder

Reg. 61368

Patent attorney

Orrick, Herrington & Sutcliffe LLP

Irvine, CA · 92614

415-686-5625

Beatrice Y Tam

Reg. 71133

Patent agent

Hewlett-Packard Company

Palo Alto, CA · 94304

650-857-6306

Jonathan C Tam

Reg. 62352

Patent attorney

Antioch, CA · 94531

415-420-7403

Kam T Tam

Reg. 35756

Patent attorney

San Diego, CA · 92192

858-886-6291

Larry Tam

Reg. 54483

Patent attorney

San Franscisco, CA · 94121

415-751-5321

Maria W Tam

Reg. 44369

Patent attorney

Monterey Park, CA · 91754

626-281-9353

Matthias L Tam

Reg. 30114

Patent attorney

Arcadia, CA · 91006

626-203-3431

Michael S. Tam

Reg. 83195

Patent agent

Castro Valley, CA · 94552

510-828-9715

Stacey M. Tam

Reg. 68628

Patent attorney

JUUL Labs, Inc.

San Francisco, CA · 94104

925-330-2137

Steven K. Tam

Reg. 72151

Patent attorney

Lowenstein Sandler PC

Palo Alto, CA · 94301

650-433-5612

Tobey M Tam

Reg. 54484

Patent agent

T. Tam Cousulting

San Diego, CA · 92129

858-240-0076

Gregory B. Tamai

Reg. 65226

Patent agent

San Francisco, CA · 94147

415-433-6333

Brian S Tamsut

Reg. 77565

Patent attorney

SoCal IP Law Group LLP

Westlake Village, CA · 91362

805-230-1350

Ronald S Tamura

Reg. 43179

Patent attorney

Thousand Oaks, CA · 91360

949-338-6090

Carina M Tan

Reg. 45769

Patent attorney

SHEPPARD, MULLIN, RICHTER & HAMPTON LLP

Palo Alto, CA · 94301

650-815-2600

Christopher C Tan

Reg. 61950

Patent agent

Van Pelt, Yi & James, LLP

Cupertino, CA · 95014

408-973-2585

Douglas Tan

Reg. 62927

Patent agent

San Diego, CA · 92129

858-602-8138

Feiwen Tan

Reg. 84422

Patent agent

San Jose, CA · 95129

408-597-2998

Jerry Tan

Reg. 80556

Patent attorney

Jerry Tan

Stockton, CA · 95202

209-468-8430

Lee K Tan

Reg. 39447

Patent agent

Genetech, Inc.

South San Francisco, CA · 94080

650-225-4462

Weiwen Tan

Reg. 75751

Patent attorney

ASML

San Diego, CA · 92127

858-385-7300

Tomoyuki Tanaka

Reg. 52273

Patent attorney

Concord, CA · 94520

510-663-3691

Iuliana Tanase

Reg. 63357

Patent attorney

Dobly Laboratories Inc.

San Francisco, CA · 94103

415-357-7148

Eric L Tanezaki

Reg. 40196

Patent attorney

Stetina Brunda Garred and Brucker

Aliso Viejo, CA · 92656

949-855-1246

Alexander I Tang

Reg. 77842

Patent agent

Etekcity

Anaheim, CA · 92806

714-463-6984

Carolyn C Tang

Reg. 57881

Patent agent

Medivation, Inc.

San Francisco, CA · 94105

415-275-5755

Haiyan Tang

Reg. 67196

Patent attorney

Orrick, Herrington & Sutcliffe LLP

Menlo Park, CA · 94025

650-614-7400

Henry Tang

Reg. 67367

Patent attorney

Facebook

Menlo Park, CA · 94025

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.