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 Kenja IP Law PC, Simpson Thacher & Bartlett, LLP, and Loyola Law School.

Top cities in California

All practitioners in California

Ying Jiang

Reg. 70071

Patent agent

Kenja IP Law PC

Palo Alto, CA · 94303

650-561-4758

Yuan Qing Jiang

Reg. 53074

Patent agent

San Jose, CA · 95128

650-279-6989

Suzanne Jillo

Reg. 44888

Patent attorney

San Jose, CA · 95125

408-448-0576

Bo Jin

Reg. 80983

Patent attorney

Simpson Thacher & Bartlett, LLP

Palo Alto, CA · 94304

650-251-5068

David Mingze Jin

Reg. 903205

Limited recognition

Loyola Law School

Los Angeles, CA · 90015

415-314-9385

Jian Jin

Reg. 63833

Patent agent

Los Gatos, CA · 95032

408-221-9260

Jigang Jin

Reg. 60592

Patent agent

JIN LAW FIRM

Burlingame, CA · 94011-1455

408-220-4350

Mei Jin

Reg. 77108

Patent attorney

Wilson Sonsini Goodrich & Rosati

Palo Alto, CA · 94304

650-849-3425

Qingwu Jin

Reg. 67134

Patent agent

San Jose, CA · 95120

408-724-7738

Zheng Jin

Reg. 57611

Patent attorney

Imperium Patent Works

Sunol, CA · 94586

925-862-9972

Jennifer S. Jo

Reg. 81761

Patent attorney

Huntington Beach, CA · 92647

714-224-9140

Sung Hi Jo

Reg. 56734

Patent attorney

Los Angeles, CA · 90057

213-876-4988

Jonathan Edward Jobe· Jr

Reg. 28429

Patent attorney

Duane Morris LLP

San Diego, CA · 92101

619-744-2232

Matthew Francis Jodziewicz

Reg. 30858

Patent attorney

Los Angeles, CA · 90049

310-471-1519

Teddy K Joe

Reg. 51850

Patent attorney

TKJ-LAW

San Francisco, CA · 94127

713-941-9413

Dag Hoffseide Johansen

Reg. 36172

Patent attorney

Menlo Park, CA · 94025

650-814-4589

Jeremy P. Johansen

Reg. 83440

Patent attorney

San Diego, CA · 92130

858-707-4133

Walter Edward Johansen· III

Reg. 26744

Patent attorney

Santa Monica, CA · 90404

310-795-7425

Athena C Johns

Reg. 64771

Patent attorney

Morgan, Lewis & Bockius LLP

Palo Alto, CA · 94304

650-843-7517

Aaron S. Johnson

Reg. 74164

Patent attorney

Anduril Industries, Inc.

Costa Mesa, CA · 92626

949-817-9483

Avery I Johnson

Reg. 79010

Patent agent

Kubota & Basol LLP

Los Angeles, CA · 90071

213-880-3643

Benjamin P Johnson

Reg. 70348

Patent attorney

ecoATM, LLC

San Diego, CA · 92121

949-838-7008

Brent A. Johnson

Reg. 51851

Patent attorney

Maschoff Brennan

Irvine, CA · 92618

949-202-1900

Bryan E Johnson

Reg. 69156

Patent attorney

Paramount, CA · 90723

310-648-5015

Bryan J. Johnson

Reg. 77244

Patent attorney

Knobbe Martens

San Francisco, CA · 94104

415-954-4114

Bryce A. Johnson

Reg. 74733

Patent attorney

Buche & Associates, P.C.

La Jolla, CA · 92037

858-459-9111

Christine Johnson

Reg. 38507

Patent attorney

Upwork

Palo Alto, CA · 94301

267-275-1245

Daniel Enoch Johnson

Reg. 37033

Patent agent

San Jose, CA · 95119

408-677-0956

Doyle B Johnson

Reg. 39240

Patent attorney

Moraga, CA · 94556

925-323-1074

Emily C. Johnson

Reg. 60269

Patent attorney

Amgen

Thousand Oaks, CA · 91320

805-477-0150

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.