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, its RevenueBase Smart Search rating, 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 Smart Search, 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 RevenueBase Smart Search rating 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

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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. RevenueBase Smart Search rates how each company's information relates to international patent law firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Perkins Coie	Indirect evidence	Seattle, WI, United StatesHQ checked Sep 4, 2026	1,001-5,000	2,734 contacts →
	Indirect evidence “Perkins Coie has combined with Ashurst to form Ashurst Perkins Coie.” Source: RevenueBase Database · checked Sep 4, 2026
2	Crowell & Moring	Strong evidence	Washington, IL, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,626 contacts →
	Strong evidence “Crowell & Moring is an international law firm with operations in the United States, Europe, MENA, and Asia.” Source: RevenueBase Database · checked Sep 4, 2026
3	Fish & Richardson P.C	Partial evidence	Boston, TX, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,534 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 4, 2026
4	Finnegan, Henderson, Farabow, Garrett & Dunner, LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	501-1,000	942 contacts →
	Indirect evidence “When your most valuable assets are ideas, innovation, and brand-you need the best.” Source: RevenueBase Database · checked Sep 4, 2026
5	Maxval Group, INC	Indirect evidence	Los Altos, CA, United StatesHQ checked Sep 4, 2026	501-1,000	757 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 4, 2026
6	Butler Snow LLP	Indirect evidence	Ridgeland, TN, United StatesHQ checked Sep 4, 2026	501-1,000	692 contacts →
	Indirect evidence “With over 400 attorneys in offices in Albuquerque, Ambler (PA), Atlanta, Austin, Baton Rouge, Bethlehem (PA), Birmingham, Boston, Charleston, Dallas, Denver, Gulfport, Huntsville…” Source: RevenueBase Database · checked Sep 4, 2026
7	Knobbe Martens	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 4, 2026	501-1,000	618 contacts →
	Indirect evidence “Knobbe Martens protects the ideas that drive innovation and propel our world forward.” Source: RevenueBase Database · checked Sep 4, 2026
8	Sterne, Kessler, Goldstein & FOX	Partial evidence	Washington, DC, United StatesHQ checked Sep 4, 2026	201-500	474 contacts →
	Partial evidence “Sterne, Kessler, Goldstein & Fox is a full-service intellectual property law firm that provides innovative solutions tailored to your business and industry.” Source: RevenueBase Database · checked Sep 4, 2026
9	Wolf Greenfield	Indirect evidence	Boston, NY, United StatesHQ checked Sep 4, 2026	201-500	432 contacts →
	Indirect evidence “Wolf, Greenfield & Sacks, P.C.” Source: RevenueBase Database · checked Sep 4, 2026
10	Sandberg Phoenix	Indirect evidence	St Louis, FL, United StatesHQ checked Sep 4, 2026	201-500	389 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 4, 2026
11	Wiggin And Dana LLP	Partial evidence	New Haven, CT, United StatesHQ checked Sep 4, 2026	201-500	361 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 4, 2026
12	Hahn Loeser & Parks LLP	Partial evidence	Cleveland, FL, United StatesHQ checked Sep 4, 2026	201-500	352 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 4, 2026
13	Merchant & Gould P.C	Strong evidence	Minneapolis, CA, United StatesHQ checked Sep 4, 2026	201-500	318 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 4, 2026
14	Banner Witcoff	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	201-500	286 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 4, 2026
15	Lathrop Gage	Indirect evidence	Kansas City, KS, United StatesHQ checked Sep 4, 2026	501-1,000	283 contacts →
	Indirect evidence “Lathrop Gage clients are the backbone of our economy.” Source: RevenueBase Database · checked Sep 4, 2026
16	Schwegman Lundberg & Woessner, P.A	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 4, 2026	201-500	276 contacts →
	Partial evidence “SLW is a boutique law firm dedicated to protecting intellectual property.” Source: RevenueBase Database · checked Sep 4, 2026
17	Harness IP	Strong evidence	Bloomfield Hills, MI, United StatesHQ checked Sep 4, 2026	201-500	264 contacts →
	Strong evidence “Harness IP’s team of patent and trademark attorneys serve clients in all areas of intellectual property law.” Source: RevenueBase Database · checked Sep 4, 2026
18	Irell & Manella LLP	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 4, 2026	201-500	261 contacts →
	Partial evidence “Irell & Manella LLP is a law firm focused on complex commercial and IP litigation.” Source: RevenueBase Database · checked Sep 4, 2026
19	Cantor Colburn LLP	Partial evidence	Hartford, CT, United StatesHQ checked Sep 4, 2026	201-500	222 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 4, 2026
20	Marshall, Gerstein & Borun LLP	Partial evidence	Chicago, NC, United StatesHQ checked Sep 4, 2026	51-200	214 contacts →
	Partial evidence “Marshall, Gerstein & Borun LLP has one focus - intellectual property law.” Source: RevenueBase Database · checked Sep 4, 2026
21	Musick, Peeler & Garrett	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 4, 2026	201-500	202 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 4, 2026
22	Fross Zelnick Lehrman & Zissu	Partial evidence	New York, NY, United StatesHQ checked Sep 4, 2026	51-200	181 contacts →
	Partial evidence “Fross Zelnick is consistently recognized by clients and peers as one of the top IP law firms in the world.” Source: RevenueBase Database · checked Sep 4, 2026
23	Dority & Manning, P.A	Partial evidence	Greenville, NC, United StatesHQ checked Sep 4, 2026	51-200	178 contacts →
	Partial evidence “Formed in 1984, Dority & Manning is a full-service intellectual property law firm.” Source: RevenueBase Database · checked Sep 4, 2026
24	Mcandrews, Held & Malloy, LTD	Partial evidence	Chicago, United StatesHQ checked Sep 4, 2026	51-200	166 contacts →
	Partial evidence “McAndrews, Held & Malloy is a premier, full-service intellectual property and technology law firm.” Source: RevenueBase Database · checked Sep 4, 2026
25	Brooks Kushman P.C	Indirect evidence	Royal Oak, MI, United StatesHQ checked Sep 4, 2026	51-200	163 contacts →
	Indirect evidence “The most effective IP solutions come from putting great minds together-yours and ours.” Source: RevenueBase Database · checked Sep 4, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: international patent law firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names international patent law firms.
Partial evidence: Its own public description names part of international patent law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name international patent law firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

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

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

As of Sep 4, 2026

57.3%Verified-email coverage

51.1%Mobile-number coverage

17.3Average contacts per company

1-10Median size (employees)

5.3%Largest-city concentration · New York

Sep 4, 2026Page data refreshed

Companies by employee count

1-10

1,232

11-50

488

51-200

127

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

00–30

1,54931–60

10,02061–90

7,04290–180

99180+

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 RevenueBase Smart Search 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 Smart Search, 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.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names international patent law firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
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 its RevenueBase Smart Search 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

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names international patent law firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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.

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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 Smart Search, 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.