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 Beckman Coulter, Bill & Mary Lou INC, and Law Office of David Keyzer, P.C..

Top cities in California

All practitioners in California

Hemant H Kewalramani

Reg. 43713

Patent attorney

Anaheim, CA · 92807

714-335-4590

Brian B Kewo

Reg. 68586

Patent agent

Eastvale, CA · 92880

646-450-5396

Daniel A Keys

Reg. 61650

Patent agent

Beckman Coulter

Irvine, CA · 92604-3315

949-551-1066

William J Keyworth

Reg. 47704

Patent agent

Bill & Mary Lou INC

San Francisco, CA · 94111

415-397-8056

David M Keyzer

Reg. 56812

Patent attorney

Law Office of David Keyzer, P.C.

El Dorado Hills, CA · 95762

916-243-5259

William Brian Kezer

Reg. 37369

Patent attorney

Mintz Levin Cohn Ferris Glovsky and Popeo, P.C.

San Francisco, CA · 94104

415-432-6111

Anbar F. Khal

Reg. 59088

Patent attorney

Oakley, Inc.

Foothill Ranch, CA · 92610

949-672-6983

Nusrat Khaleeli

Reg. 61834

Patent attorney

San Jose, CA · 95118

408-774-0593

Omid E. Khalifeh

Reg. 67018

Patent attorney

Omni Legal Group

Los Angeles, CA · 90024

310-276-6664

Abdulahad Khan

Reg. 66925

Patent agent

Dublin, CA · 94568

817-875-2253

Athar A Khan

Reg. 60271

Patent attorney

Law Offices of Athar A. Khan

Irvine, CA · 92618

949-432-6529

Elaine M Khan

Reg. 50235

Patent agent

Mather, CA · 95655

916-366-0511

Karin C. Khan

Reg. 60763

Patent attorney

Newport Beach, CA · 92663

949-258-4388

Sikander M. Khan

Reg. 78888

Patent attorney

Haynes Beffel & Wolfeld, LLP

Half Moon Bay, CA · 94019

650-479-9257

Tamiz R Khan

Reg. 46273

Patent attorney

Oakland, CA · 94610

415-596-2566

Waheed U Khan

Reg. 65574

Patent attorney

Daylight Law, P.C.

Palo Alto, CA · 94306

512-470-7081

Nasser B. Khateeb

Reg. 83775

Patent agent

Umberg/Zipser LLP

Irvine, CA · 92614

949-679-0052

Ilja V. Khavrutskii

Reg. 84188

Patent attorney

Knobbe, Martens, Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Georgiy Khayet

Reg. 59595

Patent attorney

IP Jurists PC

Irvine, CA · 92618

650-646-4020

Vladimir Khiterer

Reg. 46168

Patent attorney

Khiterer Law Office

Newport Beach, CA · 92663

949-631-6161

Aida Khodadad

Reg. 78951

Patent agent

Mercedes Benz Research and Development

Sunnyvale, CA · 94085

480-737-1990

Audrey L. Khoo

Reg. 66366

Patent attorney

Chang & Cot?, LLP

City of Industry, CA · 91748

626-854-2112

Denis Khoo

Reg. 53117

Patent agent

Arcadia, CA · 91007

626-644-5466

Abhay Khosla

Reg. 59825

Patent agent

Sherman & Nathanson

Beverly Hills, CA · 90212

310-246-0321

Arman Khosraviani

Reg. 63270

Patent agent

Ascent Horizon LLC

Irvine, CA · 92614

408-728-5120

Afif G Khoury

Reg. 53118

Patent attorney

Wilson Sonsini Goodrich and Rosati

Palo Alto, CA · 94304

650-493-9300

Andrew N. Khouzam

Reg. 69092

Patent attorney

Frost Brown Todd LLP

San Francisco, CA · 94104

415-857-8309

Daniel C. Kiang

Reg. 79631

Patent attorney

Knobbe Martens Olson & Bear, LLP

Irvine, CA · 92614

949-760-0404

Maritza D. Kidd

Reg. 81275

Patent attorney

Intuitive Surgical, Inc.

Sunnyvale, CA · 94086-5301

408-523-2100

Lynn J Kidder

Reg. 56107

Patent agent

Bozicevic, Field & Francis, L.L.P.

East Palo Alto, CA · 94303

650-327-3400

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.