Connecticut

Patent attorneys in Connecticut

Connecticut hosts 744 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 Connecticut. 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 Cantor Colburn LLP, Ware Fressola Van De Sluys and Adolphson, and Bachman and LaPointe PC.

Top cities in Connecticut

All practitioners in Connecticut

Troy Jon LaMontagne

Reg. 47239

Patent attorney

Cantor Colburn LLP

Hartford, CT · 06103

860-286-2929 X1132

Kenneth Q Lao

Reg. 40061

Patent agent

Ware Fressola Van De Sluys and Adolphson

Monroe, CT · 06484

203-261-1234

Gregory Paul LaPointe

Reg. 28395

Patent attorney

Bachman and LaPointe PC

New Haven, CT · 06510

203-777-6628

Monica J. Laskos

Reg. 77417

Patent attorney

McCarter & English

Hartford, CT · 06484

860-275-6775

Charles Joseph Laughon· II

Reg. 31389

Patent attorney

Darien, CT · 06820

203-981-2334

Gary E. Lavelle

Reg. 66063

Patent agent

Avon, CT · 06001

860-673-8348

Marylou J Lavoie

Reg. 36194

Patent attorney

Simsbury, CT · 06070

860-651-3130

Teresa A Lavoie

Reg. 42782

Patent attorney

Treeline Biosciences, Inc.

Stamford, CT · 06901

612-987-4220

Julianna Marie Lawrence

Reg. 903208

Limited recognition

University of Connecticut School of Law

Hartford, CT · 06105-2290

860-491-8974

Matthew Brad Lawrence

Reg. 47210

Patent attorney

Cantor Colburn, LLP

Hartford, CT · 06103-3207

860-286-2929

Joseph Louis Lazaroff

Reg. 23096

Patent attorney

Law Offices of Joseph L Lazaroff

Rowayton, CT · 06853

203-838-8037

Edward S Lazer

Reg. 47738

Patent agent

Boehringer Ingelheim Pharmaceuticals INC

Ridgefield, CT · 06877

203-798-5138

Amy M Leahy

Reg. 47739

Patent agent

Leahy IP Law, LLC

Stamford, CT · 06902

203-653-7194

Edouard G Lebel

Reg. 43742

Patent attorney

Boehringer Ingelheim Corporation

Ridgefield, CT · 06877-0368

203-778-7635

Jeffrey C Lee

Reg. 43743

Patent attorney

Boehringer Ingelheim

Ridgefield, CT · 06877

203-448-1860

Jong H Lee

Reg. 36197

Patent attorney

Ruggiero McAllister & McMahon

Stamford, CT · 06901

203-293-7656

Benjamin J Lehberger

Reg. 56217

Patent attorney

Dilworth IP, LLC

New Haven, CT · 06513

203-220-8496

Kenneth Gibner Lehmann

Reg. 26294

Patent agent

Fairfield, CT · 068252332

203-814-0884

Joseph G. Leichter

Reg. 76595

Patent attorney

Winsted, CT · 06098

347-683-7961

Brian A Lemm

Reg. 43748

Patent attorney

Pitney Bowes Inc.

Danbury, CT · 06810

203-796-6697

Daniel P Lent

Reg. 44867

Patent attorney

Cantor Colburn LLP

Hartford, CT · 06103

860-286-2929

Karen Marie Leser

Reg. 50548

Patent attorney

State of Connecticut

Hart Ford, CT · 06106

860-702-3106

Brian R Leslie

Reg. 36076

Patent attorney

The Jackson Laboratory

Farmington, CT · 04032

207-288-6042

Brendon P. Levesque

Reg. 53209

Patent attorney

Horton, Dowd, Bartschi & Levesque, P.C.

Hartford, CT · 06105

860-522-8338

Nathaniel Levin

Reg. 34860

Patent attorney

Buckley, Maschoff & Talwalkar

New Canaan, CT · 06840

203-594-9955

John Francis Levis

Reg. 34210

Patent attorney

Bristol-Myers Squibb

Wallingford, CT · 06492

203-677-3782

Holly Y Li

Reg. 58596

Patent attorney

IP Advantagages, LLC

Greenwich, CT · 06830

917-535-3596

Jinggao Li

Reg. 64450

Patent attorney

Dragon Sun Law Firm，PC

Norwalk, CT · 06825

631-741-9685

Guyan Liang

Reg. 63065

Patent attorney

BioXcel Therapeutics, Inc

New Haven, CT · 06511

475-281-6402

Larry Liberchuk

Reg. 40352

Patent attorney

Phillips Intellectual Property & Standards

Stamford, CT · 06905

203-351-5712

Common questions

Do I need a patent attorney based in Connecticut?

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 Connecticut-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 Connecticut?

744 active USPTO-registered patent practitioners list a Connecticut 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.