Maryland

Patent attorneys in Maryland

Maryland hosts 1,200 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 Maryland. 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 NIH Branch--HHS Office of the General Counsel, CYTEC ENGINEERED MATERIALS inc., and Northrop Grumman Corporation.

Top cities in Maryland

All practitioners in Maryland

Oyvind Dahle

Reg. 75239

Patent agent

Potomac, MD · 20854

301-755-4625

Angela Yijun Dai

Reg. 52792

Patent attorney

NIH Branch--HHS Office of the General Counsel

Bethesda, MD · 20892

301-496-6043

Thi D Dang

Reg. 53877

Patent attorney

CYTEC ENGINEERED MATERIALS inc.

Havre De Grace, MD · 21078

703-567-1370

Thu A Dang

Reg. 41544

Patent attorney

Northrop Grumman Corporation

Linthicum, MD · 21090

Samuel T. Dangremond

Reg. 60466

Patent attorney

Plumsea Law Group, LLC

Bethesda, MD · 20817

Ann Oliver Portell Daniels

Reg. 45839

Patent attorney

Glaxo Smith Kline Vaccines Legal

Rockville, MD · 20850

202-308-5245

Maya Das

Reg. 62112

Patent attorney

Gaithersburg, MD · 20878

240-812-3083

Harish T. Dass

Reg. 76158

Patent agent

Gaithersburg, MD · 20879

301-330-4325

Michael David

Reg. 44642

Patent attorney

Capitol City TechLaw, PLLC

Ellicott City, MD · 21043

888-703-1110 X6

Kathleen M Davies

Reg. 76077

Patent attorney

Food and Drug Administration

Silver Spring, MD · 20993

410-598-3833

C. Quentin Davis

Reg. 56523

Patent agent

BioVeris Corporation

Gaithersbury, MD · 20877

301-869-9800 X 2097

James H Davis

Reg. 40582

Patent attorney

Highland, MD · 20777

410-531-4812

Kristin I Davis

Reg. 51599

Patent attorney

U.S. Food & Drug Administration

Silver Spring, MD · 20993

301-796-0418

Monica S Davis

Reg. 44492

Patent attorney

Largo, MD · 20774

202-498-7073

Peter J Davis

Reg. 36119

Patent agent

Whiteford, Taylor & Preston, LLP

Baltimore, MD · 21202-1636

410-347-8738

Stephanie L Davis

Reg. 72158

Patent agent

Laboratory Corporation of America Holdings

Baltimore, MD · 21224

216-548-0420

Michael A Dean

Reg. 45654

Patent attorney

Baltimore, MD · 21222-1036

410-631-4040

Mark J DeBoy

Reg. 66983

Patent agent

Edell, Shapiro & Finnan, LLC

Gaithersburg, MD · 20850

240-864-2459

William F Dee

Reg. 46657

Patent attorney

National Institutes of Health

Rockville, MD · 20850

240-276-5717

Andrea E Deering

Reg. 50314

Patent agent

UM Venures, College Park

College Park, MD · 20740

410-405-6269

John David Del Ponti

Reg. 24258

Patent attorney

Stanley Black & Decker, Inc.

Towson, MD · 21286

410-716-2747

Gerard D Del Rosso

Reg. 43405

Patent agent

Gerard Del Rosso

Hyttsville, MD · 20782-1146

301-277-7978

Wesley A. Demory

Reg. 65360

Patent agent

Thomsen & Burke LLP

Baltimore, MD · 21201

410-539-2691

James M Denaro

Reg. 54063

Patent attorney

James Denaro Legal Services, LLC

Bethesda, MD · 20827

202-596-7303

Philippe S. Derakshani

Reg. 66195

Patent agent

Easton, MD · 21601

703-424-4088

James R Derry

Reg. 57890

Patent attorney

Arbitron Inc.

Columbia, MD · 21046-1572

410-312-8246

Steven C DeSmet

Reg. 60428

Patent attorney

Griffin & Leahy, LLC

Calverton, MD · 20705

301-572-6872

Brian J Detwiler

Reg. 57860

Patent attorney

Brian J. Detwiler, Esq.

Chevy Chase, MD · 20815

703-351-8788

Martin P Devenport

Reg. 62517

Patent agent

Amplimmune Inc.

Rockville, MD · 20850

301-309-9800

Rohit K Dewan

Reg. 74007

Patent attorney

Department of Navy

Patuxent River, MD · 20670

240-561-1122

Common questions

Do I need a patent attorney based in Maryland?

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 Maryland-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 Maryland?

1,200 active USPTO-registered patent practitioners list a Maryland 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.