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 Alston & Bird LLP, PACT Pharma, and KILPATRICK TOWNSEND & STOCKTON LLP.

Top cities in California

All practitioners in California

Javed S M Afzal

Reg. 47222

Patent agent

Walnut Creek, CA · 94598

925-934-0241

Anchal Agarwal

Reg. 82967

Patent agent

Alston & Bird LLP

San Francisco, CA · 94105

510-566-1156

Atulya R Agarwal

Reg. 40887

Patent attorney

PACT Pharma

hayward, CA · 94545

650-245-4819

Nisha Agarwal

Reg. 67039

Patent attorney

KILPATRICK TOWNSEND & STOCKTON LLP

Walnut Creek, CA · 94596

925-472-5000

Hector A Agdeppa

Reg. 58238

Patent attorney

Mountain View, CA · 94043

408-701-6161

Kavita Aggarwal

Reg. 60260

Patent attorney

Coupons.com Incorporated

Mountain View, CA · 94043

650-380-9072

Raghav Aggarwal

Reg. L1164

Limited recognition

Baker Botts LLP

Palo Alto, CA · 94304-1007

408-679-3409

Payam P Aghabala

Reg. 50885

Patent agent

Tarzana, CA · 91356

818-881-4849

Alina Aghakhani

Reg. 75519

Patent attorney

Burbank, CA · 91501

818-421-8916

Bridgette A Agness

Reg. 59596

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Los Angeles, CA · 90071

213-620-1780

Eric M Agovino

Reg. 61903

Patent attorney

Amgan Inc.

Thousand Oaks, CA · 91320

805-447-0464

Ritesh Agrawal

Reg. 62310

Patent attorney

Pivot Bio

Berkeley, CA · 94710

510-292-3519

Kenechi R Agu

Reg. 69662

Patent attorney

Law Offices of Kenechi R. Agu

Gardena, CA · 90248

310-431-9875

Regina L Agulto

Reg. 83754

Patent agent

Glendale, CA · 91206

818-852-8527

Matthew Lawrence Ahart

Reg. 60785

Patent attorney

Matthew L. Ahart

Encino, CA · 91436

818-387-6099

Kevin D. Ahlstrom

Reg. 76247

Patent attorney

Baker Botts, LLP

Palo Alto, CA · 94304

650-739-7578

Michael M Ahmadshahi

Reg. 52876

Patent attorney

AHMADSHAHI LAW OFFICES

Newport Beach, CA · 92660

949-556-8800

William F Ahmann

Reg. 52548

Patent attorney

Ahmann Kloke LLP

Palo Alto, CA · 94301

415-859-0134

Dohyun Ahn

Reg. 63237

Patent attorney

WTA Patents

Santa Clara, CA · 95054

650-547-5457

Don H Ahn

Reg. 42255

Patent agent

Savi Technology, Inc.

Stockton, CA · 95206

408-462-0462

Hanna S Ahn

Reg. 61685

Patent attorney

Lake Forest, CA · 92630

949-859-2317

Hyungsoo Ahn

Reg. 74118

Patent attorney

Gupta Evans and Associates

San Diego, CA · 92101

619-866-3444

James W. Ahn

Reg. 59079

Patent attorney

Ahn IP Law

Los Angeles, CA · 90025

424-326-3171

Joshua J Ahn

Reg. 59100

Patent agent

Stradling Yocca Carlson & Rauth, P.C.

Santa Barbara, CA · 93101

818-481-7902

Juwon Ahn

Reg. 79829

Patent attorney

Covington & Burling LLP

San Francisco, CA · 94105-2533

415-591-7091

Sejin Q Ahn

Reg. 73238

Patent attorney

Neurocrine Biosciences, Inc.

San Diego, CA · 92130

858-378-3495

Erik M. Ahroon

Reg. 66042

Patent agent

Acacia Research Group LLC

Irvine, CA · 92614

949-480-8340

Bing Ai

Reg. 43312

Patent attorney

Perkins Coie LLP

San Diego, CA · 92130-2594

858-720-5707

Chuan D. Ai

Reg. 65147

Patent agent

Stanford University

Palo Alto, CA · 94306

650-888-9981

Charity T Aiken

Reg. 70952

Patent agent

Morrison & Foerster LLP

San Diego, CA · 92130

858-720-5114

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.