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 Dawes Patent Law Group, Triple Ring Technologies, Inc., and Davidson Law Group.

Top cities in California

All practitioners in California

Sabrina N David

Reg. 69904

Patent agent

Triple Ring Technologies, Inc.

Newark, CA · 94560

510-592-3000

Ben M Davidson

Reg. 38424

Patent attorney

Davidson Law Group

Los Angeles, CA · 90064

310-473-2300

Michael S Davidson

Reg. 43577

Patent attorney

Vista IP Law Group LLP

Irvine, CA · 92618

925-299-2922

Steven V Davies· Jr

Reg. 73894

Patent attorney

Neurocrine Biosciences, inc.

San Diego, CA · 92130

619-301-4154

Aaron M. B. Davis

Reg. 62027

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

858-707-4000

Ashley K Davis

Reg. 82388

Patent agent

Los Angeles, CA · 90057

310-384-3096

Christopher R Davis

Reg. 71616

Patent attorney

Poway, CA · 62064

408-260-5896

Edward E Davis

Reg. 35112

Patent agent

San Jose, CA · 95125

408-297-1982

James L Davis· Jr.

Reg. 57325

Patent attorney

Sheppard, Mullin, Richter & Hampton LLP

Menlo Park, CA · 94025

650-815-2684

Jennifer L Davis

Reg. 54632

Patent attorney

Genentech, Inc.

South San Francisco, CA · 94080-4990

650-467-4385

Kevin R Davis

Reg. 77040

Patent attorney

Polsinelli LLP

Los Angeles, CA · 90067

310-229-1321

Kristopher R Davis

Reg. 62063

Patent attorney

Russ August & Kabat

Los Angeles, CA · 90025

310-979-8283

Mark E. Davis

Reg. 74368

Patent agent

Knobbe Martens Olson & Bear LLP

Irvine, CA · 92614

949-760-0404

Paul Davis

Reg. 29294

Patent attorney

Morgan Hill, CA · 95307

650-704-3250

Paul W Davis

Reg. 44645

Patent attorney

Laguna Woods, CA · 92637

Terri L Davis-Smyth

Reg. 54648

Patent agent

Foster City, CA · 94404

650-341-6093

Scott H Davison

Reg. 52800

Patent attorney

Davison IP

Carlsbad, CA · 92008

619-905-7181

Keyvan Davoudian-Moghaddam

Reg. 47520

Patent attorney

Los Angeles, CA · 90067

310-433-1335

Brian E Davy

Reg. 61197

Patent attorney

Bozicevic, Field & Francis LLP

Redwood City, CA · 94065

650-327-3400

Daniel Lewis Dawes

Reg. 27123

Patent attorney

Dawes Patent Law Group

Huntington Beach, CA · 92649

714-840-0302

Marcus C Dawes

Reg. 61918

Patent attorney

Dawes Patent Law Group

Huntington Beach, CA · 92649

714-840-0302

Gregory A C Dawson

Reg. 83992

Patent agent

Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, PC

San Francisco, CA · 94104

415-432-6014

Kenneth T. Daxer

Reg. 76315

Patent agent

Sunnyvale, CA · 94087

408-736-6069

Evan S Day

Reg. 75992

Patent attorney

Perkins Coie, LLP

San Diego, CA · 92130

858-720-5700

James L. Day· Jr.

Reg. 72681

Patent attorney

Farella, Braun Martel, LLP

San Francisco, CA · 94104

415-954-4400

Michael L Day

Reg. 65069

Patent attorney

Los Angeles, CA · 90015

202-627-8288

Michael L Day

Reg. 55101

Patent attorney

Weaver Austin Villeneuve & Sampson LLP

Oakland, CA · 94612-0250

510-663-1100

Darick Dayne

Reg. 63056

Patent agent

Menlo Park, CA · 94025

Christopher A Dayton

Reg. 35114

Patent attorney

Del Mar, CA · 92014

858-337-0469

William J. Dayton

Reg. 84472

Patent agent

Torrance, CA · 90503

424-285-9496

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.