Massachusetts

Patent attorneys in Massachusetts

Massachusetts hosts 2,875 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 Massachusetts. 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 Cesari and McKenna LLP, Kacvinsky Daisak Bluni PLLC, and Patent Bots, Inc..

Top cities in Massachusetts

All practitioners in Massachusetts

Martin J O'Donnell

Reg. 24204

Patent attorney

Cesari and McKenna LLP

Boston, MA · 02210

617-951-2500

Thomas C O'Konski

Reg. 26320

Patent attorney

Cesari and McKenna LLP

Boston, MA · 02210

617-951-2500

Jerome E O'Neil

Reg. 58799

Patent attorney

Kacvinsky Daisak Bluni PLLC

Marblehead, MA · 01945

781-996-0274

Jeffrey C. O'Neill

Reg. 66118

Patent attorney

Patent Bots, Inc.

Somerville, MA · 02143

857-201-2211

Caleb M. O'Quinn

Reg. 80403

Patent agent

Cambridge, MA · 02138

918-740-0847

Cecily Anne O'Regan

Reg. 37448

Patent attorney

Fishman Stewart PLLC

East Falmouth, MA · 02536

248-594-0600

Patrick Joseph O'Shea

Reg. 35305

Patent attorney

O'Shea P.C.

Springfield, MA · 01144

413-731-3100

Novak R Obsenica

Reg. 80567

Patent agent

Dechert LLP

Boston, MA · 02110-2605

617-728-7100

Frank Robert Occhiuti

Reg. 35306

Patent attorney

Occhiuti & Rohlicek LLP

Boston, MA · 02210

617-500-2501

Ricardo Ochoa

Reg. 61545

Patent attorney

DALY, CROWLEY, MOFFORD & DURKEE, LLP

Quincy, MA · 02169

781-401-9988

Christine V Odom

Reg. 83146

Patent agent

Sail Biomedicines

Cambridge, MA · 02141

304-216-8593

Eva M Ogielska

Reg. 54344

Patent agent

Foley Hoag LLP

Boston, MA · 02210

617-832-3049

Edwin Oh

Reg. 45319

Patent attorney

SharkNinja LLC

Needham, MA · 02494

617-904-7401

Mitchihiro Ohiwa

Reg. 80225

Patent attorney

DePuy Synthes Spine

Raynham, MA · 02767

774-320-0257

Yukiko Oka

Reg. 71982

Patent agent

Edwards Wildman Palmer LLP

Boston, MA · 02199

617-239-0733

Melih Okan

Reg. 79914

Patent attorney

Waltham, MA · 02452

617-821-4771

Naomi Okugawa

Reg. 74669

Patent agent

Belmont, MA · 02478

613-308-2301

James T Olesen

Reg. 46967

Patent attorney

The Broad Institute, Inc.

Cambridge, MA · 02142

617-714-8297

Kevin A Oliver

Reg. 42049

Patent attorney

PerkinElmer, Inc.

Waltham, MA · 02451

781-663-5786

William H Oliver· III

Reg. 80822

Patent attorney

Holland & Knight LLP

Boston, MA · 02116-3889

617-573-5863

Michael Lawrence Oliverio

Reg. 30915

Patent attorney

Polsinelli P.C.

Boston, MA · 02110

617-697-8000

Byron V Olsen

Reg. 42960

Patent attorney

Laronde Bio Inc.

Somerville, MA · 02143

314-520-8396

Lin B Olsen

Reg. 41230

Patent attorney

Framingham, MA · 01701

508-877-7054

Arthur Dean Olson

Reg. 31185

Patent attorney

Dean Olson Patent Consulting

Wellfleet, MA · 02667

860-287-5497

Christopher E Olson

Reg. 55510

Patent attorney

Alkermes, Inc.

Waltham, MA · 02451

781-609-6188

Jonathan P. Olson

Reg. 79999

Patent agent

Watertown, MA · 02472

208-859-9637

Kayleigh E. OMelia

Reg. 84267

Patent agent

Lando & Anastasi, LLP

Boston, MA · 02109

617-395-7000

Anthony Peter Onello· Jr

Reg. 38572

Patent attorney

Onello & Mello, LLP

Burlington, MA · 01803

617-994-4900

Princess C Onwuzuligbo

Reg. 80000

Patent attorney

Boston, MA · 02116

856-336-6956

Kenneth C Onyema

Reg. 53414

Patent attorney

Cambridge Lawyers Group, LLC

Cambridge, MA · 02139

617-868-2500

Common questions

Do I need a patent attorney based in Massachusetts?

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 Massachusetts-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 Massachusetts?

2,875 active USPTO-registered patent practitioners list a Massachusetts 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.