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 Morgan, Lewis & Bockius LLP, INTUITIVE SURGICAL , INC ., and Dechert LLP.

Top cities in California

All practitioners in California

Peter M Loderup

Reg. 79839

Patent attorney

Morgan, Lewis & Bockius LLP

Costa Mesa, CA · 92630

714-830-0517

Gary H Loeb

Reg. 41160

Patent attorney

INTUITIVE SURGICAL , INC .

SUNNYVALE, CA · 94086

408-523-2100

Jonathan D Loeb

Reg. 44880

Patent attorney

Dechert LLP

Palo Alto, CA · 94306

650-813-4995

Keith T. K. Loebner

Reg. 76433

Patent agent

Palo Alto, CA · 94304

650-823-8064

Katja D Loeffelholz

Reg. 40768

Patent attorney

Dickenson Peatman & Fogarty

Napa, CA · 94559

707-252-7122

Christine F Loehrlein

Reg. 51012

Patent agent

Alza Corporation

Mountain View, CA · 94043

650-564-2691

April Charise Logan

Reg. 33950

Patent attorney

Solana Beach, CA · 92075

858-792-2491

Forrest Eugene Logan

Reg. 27352

Patent attorney

Law Office of F. Eugene Logan

Tustin, CA · 92780-3341

714-730-5553

Francis D. Logan

Reg. 68507

Patent attorney

Americhip, Inc.

Gardena, CA · 90248

310-323-3697

Jefferson K Logan

Reg. 40705

Patent attorney

Long Beach, CA · 90803

562-987-0119

Holly J. Logue

Reg. 47755

Patent attorney

LOGUE P.C.

San Francisco, CA · 94131

323-715-9950

Scott M Lohnes

Reg. 45451

Patent attorney

San Diego, CA · 92129

858-212-6640

Jason D Lohr

Reg. 48163

Patent attorney

Hogan Lovells US LLP

San Francisco, CA · 94111

415-374-2300

Trevor D. Lohrey

Reg. 80991

Patent agent

Wilson Sonsini Goodrich & Rosati

San Francisco, CA · 94107

415-947-2089

Timothy W Lohse

Reg. 35255

Patent attorney

Manatt, Phelps & Phillips

Redwood City, CA · 94065

650-812-1307

Michael J. Loi

Reg. 64451

Patent attorney

Hunter Industries

San Marcos, CA · 92078

760-591-7378

John B Loker

Reg. 66862

Patent attorney

Leydig, Voit, and Mayer

Walnut Creek, CA · 94596

925-482-0100

Emma Long

Reg. 83916

Patent agent

Jones Day

San Diego, CA · 92121

858-314-1189

Haixia Long

Reg. 56222

Patent agent

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP

Palo Alto, CA · 94304-1203

650-849-6617

Jonathan C. Long

Reg. 84721

Patent agent

Santa Clara, CA · 95053

949-554-8067

Michael A. Long

Reg. 59750

Patent attorney

Aexius, LLC

Rolling Hills Estates, CA · 90274-3800

310-625-3395

Xiang Long

Reg. 59525

Patent agent

Fremont, CA · 94536

650-521-3464

Robert R Longabaugh

Reg. 53234

Patent agent

Huntington Beach, CA · 92648

714-960-1036

Michael A Longo

Reg. 64172

Patent agent

Whittier, CA · 90601

562-695-1075

Anna M Longwell

Reg. 50629

Patent attorney

Palo Alto, CA · 94303

650-213-9162

Robert D Longwell

Reg. 53236

Patent attorney

Longwell & Associates

Palo Alto, CA · 94303-0064

650-213-9192

Sarah M Looff

Reg. 76937

Patent agent

Mountain View, CA · 94041

859-443-0444

Devin Lee Looijen

Reg. 64779

Patent attorney

Helix, Inc.

San Mateo, CA · 94401

844-211-2070

Vincent Look

Reg. 76392

Patent attorney

Womble Bond Dickinson LLP

Los Angeles, CA · 90025

424-369-2071

Gary L Loomis

Reg. 55403

Patent agent

G. L. Loomis & Associates, Inc.

Solana Beach, CA · 92075

858-259-9183

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.