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 Hickman, Palermo, Truong & Becker, LLP, Farella Braun + Martel LLP, and Genentech, Inc..

Top cities in California

All practitioners in California

Yiping R Liao

Reg. 60301

Patent attorney

Hickman, Palermo, Truong & Becker, LLP

San Jose, CA · 95110

408-414-1080

Winston Liaw

Reg. 78766

Patent attorney

Farella Braun + Martel LLP

San Francisco, CA · 94104

415-954-4400

Jeffrey M Libby

Reg. 48251

Patent agent

Cupertino, CA · 95014

408-253-5431

Jelena J Libby

Reg. 64347

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080

708-205-3766

Robert P Liburdy

Reg. 51947

Patent agent

Tiburon, CA · 94920

415-435-4119

Elliott Brussel Lieberman

Reg. 33414

Patent attorney

Morinelli and Lieberman

Oakland, CA · 94605

510-430-9366

Joe Liebeschuetz

Reg. 37505

Patent attorney

Alston & Bird LLP

East Palo Alto, CA · 94303

650-838-2038

Arnold W Lieman

Reg. 25693

Patent attorney

Palm Desert, CA · 92211

760-360-0304

Hien K. Lien

Reg. 75128

Patent attorney

Lowenstein Sandler LLP

Palo Alto, CA · 94301

408-838-5219

Lawrence Lien

Reg. 64776

Patent attorney

Sunnyvale, CA · 94086

650-804-7800

Eric Lorne Lifschitz

Reg. 50538

Patent attorney

Law Offices of Eric L. Lifschitz

San Francisco, CA · 94102

415-553-6055

Maria Ligai

Reg. 78373

Patent agent

San Diego, CA · 92101

619-238-1900

Brian J. K. Ligh

Reg. 79273

Patent agent

Elk Grove, CA · 95624

916-690-5979

Abigail E Lighthart

Reg. 62624

Patent attorney

Haight Brown & Bonesteel LLP

San Francisco, CA · 94111

415-281-7621

Ben T Lila

Reg. 60038

Patent attorney

Mandour & Associates

San Diego, CA · 92127

858-487-9300

Marcella Lillis

Reg. 36583

Patent attorney

FibroGen, Inc.

San Francisco, CA · 94158

415-978-1741

Booyong S Lim

Reg. 61589

Patent attorney

Angitia Biopharmaceuticals

Westlake Village, CA · 91361

818-862-2068

Chang Sik Lim

Reg. 63106

Patent agent

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Jin Soo Lim

Reg. 84572

Patent agent

San Jose, CA · 95134

978-482-5956

Kang S Lim

Reg. 37491

Patent attorney

Danville, CA · 94506

925-570-8198

Keith M Lim

Reg. 68912

Patent attorney

Schwegman Lundberg

Minneapolis, CA · 55402

201-417-7580

Kyuoke Lim

Reg. 80490

Patent agent

Redwood City, CA · 94065

646-505-7246

Lily Lim

Reg. 41153

Patent attorney

xAI, LLC

Palo Alto, CA · 94304

650-342-9600

Sal Lim

Reg. 45706

Patent attorney

Feinberg Day Alberti & Thompson LLP

Menlo Park, CA · 94025

650-618-4365

Sung Eun Lim

Reg. 78060

Patent attorney

Maynard Cooper & Gale LLP

San Francisco, CA · 94111

415-646-4713

Taehoon Lim

Reg. 83777

Patent agent

Riverside, CA · 92504

951-756-6892

Victoria T Lim

Reg. 78984

Patent agent

Ionis Pharmacueticals

Carlsbad, CA · 92010

760-603-2450

Young Hoon Lim

Reg. 77921

Patent agent

Lewis Roca Rothgerber Christie

Glendale, CA · 91203

626-795-9900

Jonathan Ong Lim-Mason

Reg. 77442

Patent attorney

The Boeing Company

Seal Beach, CA · 90740-5603

714-330-8316

Alan A Limbach

Reg. 39749

Patent attorney

DLA Piper LLP (US)

Palo Alto, CA · 94304

650-833-2433

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.