Company lists · Data refreshed September 2026

Top 25 International patent law firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 1,889 companies tracked

RevenueBase identified 1,889 international patent law firms headquartered in the United States as of September 2026 and tracks 32,653 professional contacts across them, including 18,710 with verified work emails and 16,695 with mobile numbers. New York is the largest hub.

This list covers international patent law firms headquartered in the 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

1,889Companies

32,653Contacts tracked

18,710Verified emails

16,695Mobile numbers

Unlock all 1,889 companies Free signup · no credit card · 500 free credits

The 25 largest international patent law firms based in the United States

Ranked by team size

Top 25 of 1,889 international patent law firms based in the 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	Perkins CoieIndirect evidence	Seattle, WI, United StatesHQ checked Sep 4, 2026	1,001-5,000	2,734
	“Perkins Coie has combined with Ashurst to form Ashurst Perkins Coie.” Source: company website · checked Sep 4, 2026
2	Crowell & MoringStrong evidence	Washington, IL, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,626
	“Crowell & Moring is an international law firm with operations in the United States, Europe, MENA, and Asia.” Source: company website · checked Sep 4, 2026
3	Fish & Richardson P.CPartial evidence	Boston, TX, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,534
	“As the leading intellectual property law firm, we help innovators change the world through our unmatched litigation, prosecution, and post-grant experience across venues and…” Source: company website · checked Sep 4, 2026
4	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
5	Maxval Group, INCIndirect evidence	Los Altos, CA, United StatesHQ checked Sep 4, 2026	501-1,000	757
	“Since 2004, MaxVal has helped the world's most innovative organizations capitalize on their intellectual property by being different from the legacy IP solution providers.” Source: company website · checked Sep 4, 2026
6	Butler Snow LLPIndirect evidence	Ridgeland, TN, United StatesHQ checked Sep 4, 2026	501-1,000	692
	“With over 400 attorneys in offices in Albuquerque, Ambler (PA), Atlanta, Austin, Baton Rouge, Bethlehem (PA), Birmingham, Boston, Charleston, Dallas, Denver, Gulfport, Huntsville…” Source: company website · checked Sep 4, 2026
7	Knobbe MartensIndirect evidence	Irvine, CA, United StatesHQ checked Sep 4, 2026	501-1,000	618
	“Knobbe Martens protects the ideas that drive innovation and propel our world forward.” Source: company website · checked Sep 4, 2026
8	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
9	Wolf GreenfieldIndirect evidence	Boston, NY, United StatesHQ checked Sep 4, 2026	201-500	432
	“Wolf, Greenfield & Sacks, P.C.” Source: company website · checked Sep 4, 2026
10	Sandberg PhoenixIndirect evidence	St Louis, FL, United StatesHQ checked Sep 4, 2026	201-500	389
	“Over 45 years providing superior legal services to clients of every size throughout the Midwest and across the country, Sandberg Phoenix is consistently rated as one of St.” Source: company website · checked Sep 4, 2026
11	Wiggin And Dana LLPPartial evidence	New Haven, CT, United StatesHQ checked Sep 4, 2026	201-500	361
	“Wiggin and Dana is a full-service law firm of highly talented, creative and experienced lawyers dedicated to exceeding our clients’ expectations every day.” Source: company website · checked Sep 4, 2026
12	Hahn Loeser & Parks LLPPartial evidence	Cleveland, FL, United StatesHQ checked Sep 4, 2026	201-500	352
	“Founded in 1920, Hahn Loeser & Parks LLP is a full-service law firm with offices in Cleveland and Columbus, Ohio; Naples, Fort Myers, Sarasota, Tampa and Orlando, Florida; San…” Source: company website · checked Sep 4, 2026
13	Merchant & Gould P.CStrong evidence	Minneapolis, CA, United StatesHQ checked Sep 4, 2026	201-500	318
	“An intellectual property law firm at the leading edge of patent, trademark and copyright law, licensing agreements, trade secret litigation, and more, expect a unique combination…” Source: company website · checked Sep 4, 2026
14	Banner WitcoffIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	201-500	286
	“For more than 100 years Banner Witcoff has provided sound protection and inventive intellectual property solutions for some of the world’s most innovative organizations.” Source: company website · checked Sep 4, 2026
15	Lathrop GageIndirect evidence	Kansas City, KS, United StatesHQ checked Sep 4, 2026	501-1,000	283
	“Lathrop Gage clients are the backbone of our economy.” Source: company website · checked Sep 4, 2026
16	Schwegman Lundberg & Woessner, P.APartial evidence	Minneapolis, MN, United StatesHQ checked Sep 4, 2026	201-500	276
	“SLW is a boutique law firm dedicated to protecting intellectual property.” Source: company website · checked Sep 4, 2026
17	Harness IPStrong evidence	Bloomfield Hills, MI, United StatesHQ checked Sep 4, 2026	201-500	264
	“Harness IP’s team of patent and trademark attorneys serve clients in all areas of intellectual property law.” Source: company website · checked Sep 4, 2026
18	Irell & Manella LLPPartial evidence	Los Angeles, CA, United StatesHQ checked Sep 4, 2026	201-500	261
	“Irell & Manella LLP is a law firm focused on complex commercial and IP litigation.” Source: company website · checked Sep 4, 2026
19	Cantor Colburn LLPPartial evidence	Hartford, CT, United StatesHQ checked Sep 4, 2026	201-500	222
	“Cantor Colburn LLP is one of the largest intellectual property specialty law firms in the country, providing clients worldwide with the complete range of IP legal services…” Source: company website · checked Sep 4, 2026
20	Marshall, Gerstein & Borun LLPPartial evidence	Chicago, NC, United StatesHQ checked Sep 4, 2026	51-200	214
	“Marshall, Gerstein & Borun LLP has one focus - intellectual property law.” Source: company website · checked Sep 4, 2026
21	Musick, Peeler & GarrettPartial evidence	Los Angeles, CA, United StatesHQ checked Sep 4, 2026	201-500	202
	“Musick Peeler, a premier law firm with over 80 attorneys across five offices in major commercial centers of California, exemplifies excellence in legal service.” Source: company website · checked Sep 4, 2026
22	Fross Zelnick Lehrman & ZissuPartial evidence	New York, NY, United StatesHQ checked Sep 4, 2026	51-200	181
	“Fross Zelnick is consistently recognized by clients and peers as one of the top IP law firms in the world.” Source: company website · checked Sep 4, 2026
23	Dority & Manning, P.APartial evidence	Greenville, NC, United StatesHQ checked Sep 4, 2026	51-200	178
	“Formed in 1984, Dority & Manning is a full-service intellectual property law firm.” Source: company website · checked Sep 4, 2026
24	Mcandrews, Held & Malloy, LTDPartial evidence	Chicago, United StatesHQ checked Sep 4, 2026	51-200	166
	“McAndrews, Held & Malloy is a premier, full-service intellectual property and technology law firm.” Source: company website · checked Sep 4, 2026
25	Brooks Kushman P.CIndirect evidence	Royal Oak, MI, United StatesHQ checked Sep 4, 2026	51-200	163
	“The most effective IP solutions come from putting great minds together-yours and ours.” Source: company website · checked Sep 4, 2026

Showing 25 of 1,889 international patent law firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 18,710 reachable decision-makers.

Free signup · no credit card

See all 1,889 companies

International patent law firms based in the United States at a glance

As of Sep 4, 2026

1-10Median size (employees)

New YorkLargest hub · 101 HQs

16,695Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

1,232

11-50

488

51-200

127

201-500

501-1,000

1,001-5,000

Verified emails by last verification

0–30

31–60

1,549

61–90

10,020

90–180

7,042

180+

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 the 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 United States 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, 18,710 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

Frequently asked

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

RevenueBase identified 1,889 international patent law firms headquartered in the 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?

Perkins Coie, headquartered in Madison, 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 18,710 verified decision-maker contacts tracked across these 1,889 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 1,889 international patent law firms based in the 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 · 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.