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 Maxxfom, Inc., Play First, Inc., and Intersect ENT.

Top cities in California

All practitioners in California

Heng-Chia Chang

Reg. 78035

Patent agent

Maxxfom, Inc.

Irvine, CA · 92620

510-449-8901

Hung P Chang

Reg. 58711

Patent attorney

Play First, Inc.

San Francisco, CA · 94105

415-341-7262

James K Chang

Reg. 61477

Patent attorney

Intersect ENT

Menlo Park, CA · 64025

650-681-3171

James W Chang

Reg. 52718

Patent attorney

Chang & Hale LLP

Irvine, CA · 92612

949-336-1454

Jeffrey H Chang

Reg. 70030

Patent attorney

Intuitive Surgical Operations, Inc.

Sunnyvale, CA · 94086

408-523-2100

Jinhee Chang

Reg. 71338

Patent agent

GENENTECH, INC.

South San Francisco, CA · 94080

650-785-0108

Joseph Chang

Reg. 82047

Patent agent

La Jolla, CA · 92037

626-381-8842

Josephine Eun-Jung Chang

Reg. 46083

Patent attorney

Christie, Parker & Hale, LLP

glendale, CA · 91203-1445

626-795-9900

Joshua W Chang

Reg. 70831

Patent attorney

Kwan & Olynick LLP

Berkley, CA · 94709

510-900-9501

Justin S Chang

Reg. 59684

Patent attorney

Mountain View, CA · 94043

650-623-2872

Ko-Fang Chang

Reg. 50829

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94607

510-663-1100

Lucas Shen-Lun Chang

Reg. 36102

Patent attorney

Daly City, CA · 94015

650-488-0416

Lucy Shiaowen Chang

Reg. 61131

Patent agent

San Carlos, CA · 94070

408-563-0619

Marcia R Chang

Reg. 60261

Patent attorney

Cooley Godward Kronish, LLP

Palo Alto, CA · 94306-2155

650-843-5587

Melody C Chang

Reg. 61993

Patent attorney

Fullerton, CA · 92833

714-595-4599

Ming Chieh Chang

Reg. 61962

Patent agent

FIT Electronics, Inc.

SAN JOSE, CA · 95131

408-273-6175

Nicholas T. Chang

Reg. 84642

Patent agent

San Jose, CA · 95112

760-717-3970

Nicole Ballew Chang

Reg. 61611

Patent agent

Lewis Roca Rothgerber Christie LLP

Glendale, CA · 91203

626-795-9900

Peter E Chang

Reg. 63245

Patent attorney

El Segundo, CA · 90245

310-416-0271

Randall W Chang

Reg. 40946

Patent agent

RC Patent Services

San Francisco, CA · 94127

415-609-8591

Randy K Chang

Reg. 57939

Patent attorney

Acushnet Company

Carlsbad, CA · 92010

760-930-4494

Rick C Chang

Reg. 45530

Patent attorney

McDermott Will & Emery LLP

Menlo Park, CA · 94025

650-815-7523

Sabrina A. Chang

Reg. 59252

Patent attorney

Kirkland & Ellis, LLP

San Francisco, CA · 94104

415-439-4382

Sangeun Chang

Reg. 78780

Patent attorney

Irvine, CA · 92618

312-647-9463

Shin-Tsen Chang

Reg. 66951

Patent attorney

San Jose, CA · 95134

408-470-1000

Sophia S Chang

Reg. 69407

Patent attorney

University of California, San Francisco

San Francisco, CA · 94107

415-514-6204

Stanley M. Chang

Reg. 58816

Patent attorney

Intellectual Property Investment Law Group

Santa Clara, CA · 95054

408--51-2-1907

Steven L Chang

Reg. 59424

Patent attorney

Novak Druce + Quigg LLP

San Francisco, CA · 94105

415-814-6161

Tian-Pong Chang

Reg. 70426

Patent agent

San Jose, CA · 95129

408-725-8772

Ting-Yu Chang

Reg. 83220

Patent agent

San Diego, CA · 92126

626-566-5795

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.