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 Qualcomm Incorporated, Wilson Sonsini Goodrich & Rosati, and Haynes and Boone, LLP.

Top cities in California

All practitioners in California

Bryan B Edwards

Reg. 80962

Patent agent

Wilson Sonsini Goodrich & Rosati

San Diego, CA · 92130

858-350-2396

Gary J Edwards

Reg. 41008

Patent attorney

Haynes and Boone, LLP

Palo Alto, CA · 94301

650-687-8842

Mary J Edwards

Reg. 55140

Patent attorney

Gilead Sciences, Inc.

Foster City, CA · 94404

650-522-1816

Bobbie N Eftekar

Reg. 55142

Patent agent

Quinn, Emanuel, Urquhart, Oliver & Hedges, LLP

Redwood Shores, CA · 94065

650-801-5000

Charles E Eggers

Reg. 56343

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121

858-658-1639

Sean N Eggers

Reg. 76811

Patent attorney

Snell & Wilmer, L.L.P.

Costa Mesa, CA · 92626

714-427-7045

Joan D Eggert

Reg. 32980

Patent attorney

Amgen Inc.

Thousand Oaks, CA · 91320

805-447-1000

Justin O. Ehresmann

Reg. 73867

Patent attorney

Womble Bond Dickinson (US) LLP

Glendale, CA · 91203-1445

626-795-9900

Matthew Scott Eichenfield

Reg. 60896

Patent agent

Pasadena, CA · 91125

626-628-6800

Cheryl Ann Eichstaedt

Reg. 50761

Patent agent

San Jose, CA · 95120

408-206-8915

Stefanie L Eick

Reg. 74101

Patent attorney

Eastman & McCartney, LLP

San Diego, CA · 92101

619-230-1144

Christopher B Eide

Reg. 48375

Patent attorney

Dentons Us LLP

Palo Alto, CA · 94304-1125

650-798-0300

Johan Kenneth Eide

Reg. 77264

Patent agent

Sebastopol, CA · 95472

707-540-1640

Bryan E. Eilertson

Reg. 65363

Patent agent

The Boeing Company

Seal Beach, CA · 90740-5603

714-290-1051

Chad Everett Eimers

Reg. 69771

Patent attorney

Costa Mesa, CA · 92626

714-554-6600

Gregory P Einhorn

Reg. 38440

Patent attorney

Gregory P. Einhorn, APC

San Diego, CA · 92122

619-742-0198

Michael B Einschlag

Reg. 29301

Patent attorney

Los Altos Hills, CA · 94024

650-949-2267

Michael D. Eisenberg

Reg. 50448

Patent attorney

Law Office of Michael D. Eisenberg

Encinitas, CA · 92024

858-812-0820

Heidi Leigh Eisenhut

Reg. 46812

Patent attorney

Loza & Loza, LLP

Upland, CA · 91786

562-305-5464

Robert D Eisler

Reg. 70629

Patent agent

Oak View, CA · 93022-9235

805-223-0028

Danielle A Eisner

Reg. 70833

Patent attorney

Danielle A Kieler

Rancho Santa Fe, CA · 92067

818-693-6579

Kristine Melo Ejercito Mengoli

Reg. 55147

Patent attorney

ASIC America Corporation

Irvine, CA · 92618

949-727-7182

Bryn C Ekroot

Reg. 38129

Patent attorney

Saratoga, CA · 95070

408-252-8767

Roy A Ekstrand

Reg. 27485

Patent agent

Law Offices of Roy A. Ekstrand

Costa Mesa, CA · 92626

714-662-7733

Kristine U Ekwueme

Reg. 56344

Patent attorney

Qualcomm Incorporated

San Diego, CA · 92121-1714

858-658-1901

Jamal El Yazal

Reg. 55148

Patent agent

Laguna Beach, CA · 92651

949-497-9246

Yasser M El-Gamal

Reg. 45339

Patent attorney

Manatt, Phelps & Phillips, LLP

Cosa Mesa, CA · 92626

714-371-2500

Hazem Elabbadi

Reg. 61669

Patent agent

Sony Corporation of America

San Diego, CA · 92127

858-942-3199

James J Elacqua

Reg. 28412

Patent attorney

Redwood City, CA · 94062

650-533-4342

Samir Elamrani

Reg. 43601

Patent attorney

Wilson Sonsini Goodrich and Rosati

San Diego, CA · 92130

858-350-2337

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.