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 GSS Law Group, Haynes and Boone, and Sidley Austin, LLP.

Top cities in California

All practitioners in California

Carol D Titus

Reg. 38436

Patent agent

GSS Law Group

Newark, CA · 94560

510-742-7417

Nora E. Titus

Reg. 82234

Patent attorney

Haynes and Boone

San Francisco, CA · 94111

925-395-1615

Samuel N Tiu

Reg. 47997

Patent attorney

Sidley Austin, LLP

Los Angeles, CA · 90071

213-896-6000

Maria V Tkachuk

Reg. 56632

Patent agent

Irvine, CA · 92612

949--73-7-1324

Kent J Tobin

Reg. 39496

Patent attorney

Law Office of Kent J. Tobin

San Mateo, CA · 94402

650-759-6959

Stephen Todd

Reg. 47139

Patent attorney

Danisco US Inc.

Palo Alto, CA · 94304

650-846-7595

Thomas C Tokos

Reg. 30808

Patent attorney

Intersil Corporation

Milpitas, CA · 95035

408-432-8888

Gregory P. Tolchinsky

Reg. 72183

Patent attorney

Rimon Law, P.C.

San Diego, CA · 92103

619-894-9024

Deborah E Tolomeo

Reg. 53693

Patent attorney

Santa Clara County

San Jose, CA · 95110

408-299-5900

Jason A Tolomeo

Reg. 54495

Patent agent

Los Altos, CA · 94024

650-948-2141

John M Tolpa

Reg. 50722

Patent attorney

Gunderson Dettmer Stough Villenueve Franklin & Hachigian LLP

San Diego, CA · 92130

858-436-8086

Jeffrey C. Tom

Reg. 76168

Patent agent

Monterey Park, CA · 91754

626-679-4115

Joyce A Tom

Reg. 48681

Patent attorney

Pinnacle Patent Law Group

San Francisco, CA · 94122

415-738-6356

Aleen M Tomassian

Reg. 73559

Patent agent

Tarzana, CA · 91335

818-309-7855

Michael A Tomasulo

Reg. 43957

Patent attorney

WINSTON & STRAWN LLP

Los Angeles, CA · 90071

213-615-1848

Mahmoud Munes Tomeh

Reg. 67436

Patent attorney

QUALCOMM Incorporated

San Diego, CA · 92121-1714

408-546-2045

Paul K Tomita

Reg. 43196

Patent attorney

Staniford Tomita LLP

San Francisco, CA · 94159

415-305-8948

Hideo Tomomatsu

Reg. 31309

Patent agent

Y T Assocs

Escondido, CA · 92026

760-471-2961

Lucas J. Tomsich

Reg. 76266

Patent attorney

Faegre Baker Daniels

Palo Alto, CA · 94303

650-324-6700

Thu N. Ton

Reg. 84486

Patent agent

California Institute of Technology

Pasadena, CA · 91125

360-201-6553

Connie C Tong

Reg. 52292

Patent agent

Cooley LLP

Palo Alto, CA · 94304-1130

650-843-5000

Frederick W Tong

Reg. 55680

Patent attorney

The Law Office of Fred Tong

Santa Monica, CA · 90034

424-330-5236

Grace C Tong

Reg. 64043

Patent agent

Van Pelt, Yi, & James LLP

Cupertino, CA · 94024

Peter P Tong

Reg. 35757

Patent agent

IpVenture, Inc.

Los Altos, CA · 94022

650-903-9200 EXT. 102

Rolando J Tong

Reg. 47140

Patent attorney

Law Offices of Roland Tong, PC

Irvine, CA · 92618

949-298-4080

Hannah Tongthaworn

Reg. 82430

Patent agent

Redwood City, CA · 94062

916-805-3556

Russell S Tonkovich

Reg. 64101

Patent attorney

Dentons US LLP

San Francisco, CA · 94105-1101

415-882-0388

Thomas N Toombs

Reg. 55681

Patent agent

SanDisk

Milpitas, CA · 95035-7932

408-801-1058

Elahe Sharifnejad Toosi

Reg. 57740

Patent agent

Ameh IP

Carlsbad, CA · 92013-1654

760-602-8362

Sascha E Topa

Reg. 65593

Patent agent

San Juan Capistrano, CA · 92693

949-547-7119

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.