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 Sullivan IP, Qualcomm Incorporated, and Morrison Foerster.

Top cities in California

All practitioners in California

Sona Sulakian

Reg. 81356

Patent attorney

Menlo Park, CA · 94025

408-510-9171

Maisoun Y Sulfab

Reg. 71023

Patent agent

San Francisco, CA · 94134

510-693-3907

Carter Bart Sullivan

Reg. 41516

Patent attorney

Sullivan IP

Benicia, CA · 94510

707-853-6111

Craig R. Sullivan

Reg. 53594

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-845-1961

Daniel F Sullivan

Reg. 31572

Patent attorney

Santa Clarita, CA · 91387

310-543-5205

Michael J Sullivan

Reg. 71191

Patent attorney

San Jose, CA · 95113

408-628-8882

Nicholas G. Sullivan

Reg. 78245

Patent agent

Palm Desert, CA · 92260

760-485-4592

Robert A Sullivan

Reg. 48554

Patent attorney

Santa Clara, CA · 95054

408-855-8238

Scott L Sullivan

Reg. 33126

Patent agent

San Francisco, CA · 94132

650-773-7911

Erin K. Sully

Reg. 76198

Patent attorney

Morrison Foerster

San Diego, CA · 92130

858-314-7647

Hardadi Sumadiwirya

Reg. 67079

Patent agent

Liang & Cheng, A Professional Corporation

Santa Clara, CA · 95054

425-922-8943

Matthew K Sumida

Reg. 70735

Patent attorney

Facebook

Menlo Park, CA · 94025

650-849-3479

Shunsuke Samuel Sumitani

Reg. 57196

Patent attorney

Stetina Brunda Garred & Brucker

Aliso Viejo, CA · 92656

949-855-1246

Bradley R Summers

Reg. 62351

Patent agent

Tope - McKay & Associates

Malibu, CA · 90265

310-589-8158

Craig S Summers

Reg. 31430

Patent attorney

Knobbe Martens Olson and Bear LLP

Irvine, CA · 92614

949-760-0404

Victoria C Summers

Reg. 74173

Patent agent

Pfizer Inc.

San Diego, CA · 92121

858-622-6060

Evan T. Sumner

Reg. 78612

Patent attorney

SHEPPARD MULLIN RICHTER & HAMPTON LLP

San Diego, CA · 92116

434-660-5383

John P Sumner

Reg. 33039

Patent attorney

San Diego, CA · 92127

619-990-0574

Amy Sun

Reg. 53653

Patent attorney

Irvine, CA · 92604

Brian S Sun

Reg. 64694

Patent attorney

Sorrento Therapeutics, Inc.

San Diego, CA · 92121

858-203-4100

Charles Sun

Reg. 58380

Patent agent

LIS Technologies

Walnut Creek, CA · 94597

925-934-5520

Danqiong Sun

Reg. 73059

Patent agent

Squire Patton Boggs

Palo Alto, CA · 94304

650-843-3388

Hui Sun

Reg. 61244

Patent attorney

Saratoga, CA · 95070

408-799-8687

Karl Sun

Reg. 45143

Patent attorney

Google, Inc.

Mountain View, CA · 94043

650-623-4000

Linda Z. Sun

Reg. 75961

Patent agent

Van Pelt, Yi & James LLP

Cupertino, CA · 95014

408-207-4773

Liqing L. Sun

Reg. 75775

Patent attorney

Law Office of Lee Sun

Irvine, CA · 92620

949-829-2128

Liying Sun

Reg. 65592

Patent attorney

Morgan, Lewis & Bockius LLP

Palo Alto, CA · 94304

650-843-7215

Ming Sun

Reg. 48697

Patent attorney

Fremont, CA · 94539

650-248-7524

Ningxi Sun

Reg. 82890

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

858-707-4110

Peter M Sun

Reg. 63356

Patent attorney

Law Office of Peter Sun

La Jolla, CA · 92038

858-952-1010

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.