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 Haight Brown & Bonesteel LLP, Mandour & Associates, and FibroGen, Inc..

Top cities in California

All practitioners in California

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

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

Douglas C Limbach

Reg. 35249

Patent attorney

Shay Glenn LLP

San Mateo, CA · 94403

650-212-1700

Bo-In Lin

Reg. 33948

Patent agent

Los Altos Hills, CA · 94022

650-949-0418

Chen-Chi Lin

Reg. 71500

Patent attorney

San Jose, CA · 95120

408-666-1124

Chun Shi Lin

Reg. 76916

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2300

Daniel J Lin

Reg. 47750

Patent attorney

VMware, Inc.

Palo Alto, CA · 94304

650-427-3096

Dennis C. Lin

Reg. 75105

Patent attorney

NVIDIA Corporation

Santa Clara, CA · 95051

408-486-2000

Diana C Lin

Reg. 68388

Patent agent

Schox, PLC

San Francisco, CA · 94107

415-684-8688

Edison T. Lin

Reg. 60011

Patent attorney

Bitmain Inc.

San Jose, CA · 95110

408-655-8105

Eric C Lin

Reg. 69750

Patent attorney

Intuit Inc.

Mountain View, CA · 94043

650-316-9690

Eric B Lin

Reg. 67630

Patent attorney

Immersion Corporation

San Jose, CA · 95134

408-350-8754

Erika Lin

Reg. 70807

Patent agent

Sunnyvale, CA · 94089

209-499-8387

Fiona L. Lin

Reg. 79909

Patent agent

Fish & Richardson, P.C.

Redwood City, CA · 94063

650-839-5096

Hong S Lin

Reg. 54629

Patent attorney

Kramer Alberti Lim & Tonkovich LLP

Foster City, CA · 94404

650-825-4300

Hsiang Hong Lin

Reg. 56403

Patent attorney

San Francisco, CA · 94131

415-816-9525

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.