Company lists · Data refreshed September 2026

Top 24 International patent law firms based in Washington, United States

Name: International patent law firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 81 companies tracked

RevenueBase identified 81 international patent law firms headquartered in Washington, United States as of September 2026 and tracks 2,085 professional contacts across them, including 1,248 with verified work emails. New York is the largest hub.

This list covers international patent law firms headquartered in Washington, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

81Companies

2,085Contacts tracked

1,248Verified emails

Unlock all 81 companies Free signup · no credit card · 500 free credits

The 24 largest international patent law firms based in Washington, United States

Ranked by team size

Top 24 of 81 international patent law firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names international patent law firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Finnegan, Henderson, Farabow, Garrett & Dunner, LLPIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	501-1,000	942
	“When your most valuable assets are ideas, innovation, and brand-you need the best.” Source: company website · checked Sep 4, 2026
2	Sterne, Kessler, Goldstein & FOXPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	201-500	474
	“Sterne, Kessler, Goldstein & Fox is a full-service intellectual property law firm that provides innovative solutions tailored to your business and industry.” Source: company website · checked Sep 4, 2026
3	Bookoff Mcandrews, PllcIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	89
	“How are we different?” Source: company website · checked Sep 4, 2026
4	Kelly Ip, LLPPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	34
	“Kelly IP is a leading IP law boutique focusing on litigation and counseling in trademark, unfair competition, false advertising, right-of-publicity, copyright, design protection…” Source: company website · checked Sep 4, 2026
5	Wenderoth, Lind & Ponack, L.L.PIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	33
	“Wenderoth is an Intellectual Property firm with one primary focus - prosecution.” Source: company website · checked Sep 4, 2026
6	Staas & Halsey LLPIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	32
	“Staas & Halsey LLP has provided clients with intellectual property protection and technical expertise since 1971.” Source: company website · checked Sep 4, 2026
7	Westerman Hattori Daniels & Adrian LLPPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	51-200	29
	“WHDA is a full service intellectual property law firm.” Source: company website · checked Sep 4, 2026
8	Jordan IP Law, LLCStrong evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	20
	“At Jordan IP Law, LLC, we help to extend the growth of your business by providing large firm patent experience with unprecedented personal attention at a value that meets your…” Source: company website · checked Sep 4, 2026
9	Stein IP LLCPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	16
	“Stein IP LLC is a full service intellectual property law firm with an emphasis on intellectual property creation and maximization.” Source: company website · checked Sep 4, 2026
10	Lutzker & Lutzker LLPIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	10
	“In 1998 Arnold Lutzker and Susan Lutzker founded Lutzker & Lutzker LLP with the vision of a small, dynamic practice that would specialize in digital age legal issues affecting the…” Source: company website · checked Sep 4, 2026
11	PV LAW LLPPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	8
	“Intellectual Property Law Boutique” Source: company website · checked Sep 4, 2026
12	DnlzitoIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	7
	“Established in 1989, in Washington DC, DNLZito has a reputation for providing quality service tailored to the specific needs of each client.” Source: company website · checked Sep 4, 2026
13	Greenberg & Lieberman, LLCPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	7
	“Intellectual Property Law Firm.” Source: company website · checked Sep 4, 2026
14	Dunlap Bennett & Ludwig PllcPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	7
	“We are an intellectual property firm in Washington DC handling in the US and throughout the world the filing, maintaining and protecting patent, trademarks and copyrights.” Source: company website · checked Sep 4, 2026
15	Global IP Counselors, LLPPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	6
	“Global IP provides world class IP litigation in federal courts and patent and trademark prosecution.” Source: company website · checked Sep 4, 2026
16	Winterfeldt IP GroupIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	6
	“Founded by Brian Winterfeldt, Winterfeldt IP Group offers decades of experience with brand management and protection on both analog and digital platforms.” Source: company website · checked Sep 4, 2026
17	Shruti LAW PllcPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	6
	“Shruti Law PLLC® is a Law Firm Headquartered in Washington, DC Shruti Costales is the sole owner and founder of Shruti Law PLLC®.” Source: company website · checked Sep 4, 2026
18	Laurence & Phillips IP LAWPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	5
	“Laurence & Phillips IP Law is a U.S.” Source: company website · checked Sep 4, 2026
19	Novotech Patent FirmStrong evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	5
	“NovoTech Patent Firm is a leading patent law firm with a team of seasoned patent attorneys who are dedicated to providing our clients with the highest level of legal…” Source: company website · checked Sep 4, 2026
20	Strain PllcIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	11-50	4
	“Strain PLLC is a boutique Washington, D.C.” Source: company website · checked Sep 4, 2026
21	Dowd Scheffel PllcIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	4
	“Dowd Scheffel PLLC offers the highest quality legal services for all aspects of intellectual property.” Source: company website · checked Sep 4, 2026
22	Foster Murphy Altman & Nickel, PCPartial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	4
	“Foster, Murphy, Altman & Nickel, PC is a premier boutique law firm concentrating its practice on Section 337 investigations before the U.S.” Source: company website · checked Sep 4, 2026
23	Fiala & Weaver, P.L.L.CIndirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	1-10	4
	Source: company website · checked Sep 4, 2026
24	Potomac LAW GroupIndirect evidence	Washington, United StatesHQ checked Sep 4, 2026	1-10	3
	Source: company website · checked Sep 4, 2026

Showing 24 of 81 international patent law firms based in Washington, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,248 reachable decision-makers.

Free signup · no credit card

See all 81 companies

International patent law firms based in Washington, United States at a glance

As of Sep 4, 2026

1-10Median size (employees)

New YorkLargest hub · 101 HQs

Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 81 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among international patent law firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Washington, United States whose own description of what they do matches “international patent law firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among international patent law firms, and records with no verified work email. Companies headquartered outside Washington are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 1,248 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 4, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

International patent law firms by metro in the United States

International patent law firms in New York101
International patent law firms in Washington81
International patent law firms in Chicago66
International patent law firms in Houston46
International patent law firms in Dallas41
International patent law firms in Austin38
International patent law firms in Los Angeles36
International patent law firms in Atlanta31
International patent law firms in Irvine30
International patent law firms in San Diego30
International patent law firms in San Francisco29
International patent law firms in Alexandria28
International patent law firms in Miami26
International patent law firms in Minneapolis26

Frequently asked

How many international patent law firms are there based in Washington, United States?

RevenueBase identified 81 international patent law firms headquartered in Washington, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Finnegan, Henderson, Farabow, Garrett & Dunner, LLP, headquartered in Washington, tops this list with the largest team on record.

Which city has the most international patent law firms?

New York leads with 101 headquartered companies, followed by Washington (81) and Chicago (66).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,248 verified decision-maker contacts tracked across these 81 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 4, 2026.

Ready to reach these companies? Verified emails and direct dials for all 81 international patent law firms based in Washington, United States. Start with a free account, no credit card.

Get the full list

Related lists

International patent law firms by geography

Browse the directory

Browse: Companies home · International patent law firms in United States · All United States lists · All International patent law firms lists · New lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.