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 Dickinson Wright RLLP, Rogitz & Associates, and Rogitz and Associates.

Top cities in California

All practitioners in California

Mark H Rogge

Reg. 67526

Patent attorney

Dickinson Wright RLLP

Sunnyvale, CA · 94086

408-701-6146

John M. Rogitz

Reg. 67641

Patent attorney

Rogitz & Associates

San Diego, CA · 92108

619-338-8075

John Leroy Rogitz

Reg. 33549

Patent attorney

Rogitz and Associates

San Diego, CA · 92108

619-338-8075

Kyanne R Rohatgi

Reg. 74148

Patent agent

Vir Biotechnology, Inc.

San Francisco, CA · 94158

415-321-3402

Ronald Lynn Rohde

Reg. 45050

Patent attorney

MARIPOSA, CA · 95338-1887

510-290-5210

David Allen Roise

Reg. 47904

Patent attorney

VLP Law Group LLP

Palo Alto, CA · 94301

650-472-4068

Matthew V Rojanakiathavorn

Reg. 65658

Patent attorney

Fremont, CA · 94555

510-396-0584

Daniel S Rokes

Reg. 73746

Patent agent

Chino Hills, CA · 91709

626-321-3153

Harrison W Rolfes

Reg. 80823

Patent agent

Corona Del Mar, CA · 92625

949-285-9066

Russell J. Romeo

Reg. 75110

Patent attorney

Gilead Sciences, Inc.

Foster City, CA · 94404

650-235-2431

David L. Romero

Reg. 57567

Patent attorney

McDermott Will & Emery LLP

San Diego, CA · 92122

858-535-9001

William Charles Rooklidge

Reg. 31791

Patent attorney

Laguna Beach, CA · 92651

949-939-5125

Wouter E Roorda

Reg. 69927

Patent agent

Wouter Roorda Consulting, LLC

Palo Alto, CA · 94306

650-722-0843

Traci H Ropp

Reg. 44307

Patent attorney

Maze Therapeutics

S. San Francisco, CA · 94080

415-378-8732

Wesley Charles Rosander

Reg. 51030

Patent attorney

White & Case LLP

Palo Alto, CA · 94306

650-213-0300

Carlos J Rosario

Reg. 67922

Patent attorney

San Jose, CA · 95124

310-924-9232

Arthur Saunders Rose

Reg. 28038

Patent attorney

Santa Ana, CA · 92705

949-212-0751

Bernard F Rose

Reg. 42112

Patent agent

Squire Patton Boggs (US) LLP

San Ramon, CA · 94583

925-785-9956

James Walter Rose

Reg. 34239

Patent attorney

Beyer Law Group

Palo Alto, CA · 94303

650-315-8401

Patricia A Rose

Reg. 69729

Patent agent

Gilead

Foster City, CA · 94404

650-439-7525

Robert Jay Rose

Reg. 47037

Patent attorney

Law Office of Robert Rose

Escondido, CA · 92030-1272

626-768-0876

Sara L. Rose

Reg. 68646

Patent agent

Monte Sereno, CA · 95030

408-399-3058

Ann M Roseberry

Reg. 48594

Patent agent

Incyte Genomics INC

Palo Alto, CA · 94304

650-845-4550

Joshua A. Rosefelt

Reg. 76890

Patent agent

Stanford, CA · 94305

240-620-4213

Leon David Rosen

Reg. 21077

Patent attorney

Leon D. Rosen & Associates

Los Angeles, CA · 90024

310-477-0578

Charles Rosenberg

Reg. 31464

Patent attorney

Law Offices of Charles Rosenberg

Los Angeles, CA · 90064

310-391-5839

David Rosenberg

Reg. 54409

Patent attorney

Townsend and Townsend and Crew LLP

San Francisco, CA · 94111-3834

415-576-0200

Frank S Rosenberg

Reg. 37068

Patent attorney

Agoura Hills, CA · 91301

415-383-3660

Gerald Bruce Rosenberg

Reg. 30320

Patent attorney

NewTechLaw

Palo Alto, CA · 94306-2009

650-325-2100

Matthew J. Rosenberg

Reg. 73539

Patent attorney

Paul, Weiss, Rifkind, Wharton & Garrison LLP

San Francisco, CA · 94105

628-432-5147

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.