Company lists · Data refreshed September 2026

Top 25 International patent law firms worldwide

Name: International patent law firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 6,634 companies tracked

RevenueBase identified 6,634 international patent law firms worldwide as of September 2026 and tracks 109,870 professional contacts across them, including 42,734 with verified work emails and 17,973 with mobile numbers. The United States is the largest market and New Delhi the largest hub.

This list covers international patent law firms worldwide, 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. Country and city lists for international patent law firms follow the table.

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

6,634Companies

109,870Contacts tracked

42,734Verified emails

17,973Mobile numbers

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The 25 largest international patent law firms worldwide

Ranked by team size

Top 25 of 6,634 international patent law firms worldwide, 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	Tozzinifreire Advogados	Partial evidence	São Paulo, BrazilHQ checked Sep 4, 2026	1,001-5,000	1,596 contacts →
	Partial evidence “TozziniFreire is one of the leading legal services organizations in Latin America, operating in all areas of Business Law and with a significant track record in serving national…” Source: RevenueBase Database · checked Sep 4, 2026
4	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
5	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
6	Adams & Adams	Indirect evidence	Pretoria, South AfricaHQ checked Sep 4, 2026	501-1,000	841 contacts →
	Indirect evidence “Realise African Enterprise.” Source: RevenueBase Database · checked Sep 4, 2026
7	Dannemann Siemsen	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 4, 2026	501-1,000	769 contacts →
	Indirect evidence “Dannemann Siemsen is a Brazilian firm dedicated to Intellectual Property since 1900.” Source: RevenueBase Database · checked Sep 4, 2026
8	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
9	Dennemeyer	Indirect evidence	Howald, IL, LuxembourgHQ checked Sep 4, 2026	1,001-5,000	696 contacts →
	Indirect evidence “The Dennemeyer Group offers high-quality services for the protection and management of Intellectual Property rights and is committed to being the first-choice partner for…” Source: RevenueBase Database · checked Sep 4, 2026
10	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
11	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
12	Marks & Clerk	Indirect evidence	London, United KingdomHQ checked Sep 4, 2026	501-1,000	568 contacts →
	Indirect evidence “We’re true specialists – focusing on IP and IP alone.” Source: RevenueBase Database · checked Sep 4, 2026
13	HGF Limited	Indirect evidence	Leeds, United KingdomHQ checked Sep 4, 2026	201-500	541 contacts →
	Indirect evidence “HGF is one of Europe’s largest firms of Intellectual Property specialists.” Source: RevenueBase Database · checked Sep 4, 2026
14	Smart & Biggar	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	501-1,000	517 contacts →
	Partial evidence “Smart & Biggar is widely recognized as Canada’s leading firm for intellectual property, and with over 180 lawyers, patent agents and trademark agents.” Source: RevenueBase Database · checked Sep 4, 2026
15	Anand And Anand	Partial evidence	New Delhi, IndiaHQ checked Sep 4, 2026	201-500	482 contacts →
	Partial evidence “Anand and Anand is a leading full-service intellectual property law firm, providing end-to-end legal solutions across all facets of intellectual property and allied practice areas.” Source: RevenueBase Database · checked Sep 4, 2026
16	Sagaciouselevate	Partial evidence	Seattle, United StatesHQ checked Sep 4, 2026	501-1,000	482 contacts →
	Partial evidence “Sagacious IP is the World’s LARGEST IP research firm that reliably supports the worldwide IP community including Large Corporations, Small & Mid-size Corporations, IP law firms…” Source: RevenueBase Database · checked Sep 4, 2026
17	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
18	K&s Partners	Partial evidence	Gurugram, IndiaHQ checked Sep 4, 2026	201-500	454 contacts →
	Partial evidence “K&S Partners is a leading intellectual property law firm in India, offering a full range of IP management services to clients worldwide, including Fortune 500 companies.” Source: RevenueBase Database · checked Sep 4, 2026
19	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
20	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
21	ZACCO	Strong evidence	Copenhagen, DenmarkHQ checked Sep 4, 2026	501-1,000	384 contacts →
	Strong evidence “Zacco is an international full-service IP firm, with around 125 authorised patent attorneys, 75 authorised trademark and design attorneys, and 20 experts in Digital brands and…” Source: RevenueBase Database · checked Sep 4, 2026
22	Spruson & Ferguson	Indirect evidence	Sydney, AustraliaHQ checked Sep 4, 2026	201-500	365 contacts →
	Indirect evidence “Spruson & Ferguson is a leading provider of intellectual property (IP) services across the Asia-Pacific region, with more than 490 staff working from our offices in Bangkok…” Source: RevenueBase Database · checked Sep 4, 2026
23	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
24	Khurana & Khurana	Partial evidence	New Delhi, IndiaHQ checked Sep 4, 2026	501-1,000	358 contacts →
	Partial evidence “Khurana & Khurana (K&K) is a full-service Intellectual Property, Tax, Media-Entertainment, and Commercial/Corporate Law firm giving high-end technology backed Corporate/Commercial…” Source: RevenueBase Database · checked Sep 4, 2026
25	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

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 6,634 international patent law firms worldwide

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International patent law firms worldwide at a glance

As of Sep 4, 2026

38.9%Verified-email coverage

16.4%Mobile-number coverage

16.6Average contacts per company

1-10Median size (employees)

2.5%Largest-city concentration · New Delhi

Sep 4, 2026Page data refreshed

Companies by employee count

1-10

3,897

11-50

1,972

51-200

521

201-500

150

501-1,000

1,001-5,000

10001+

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.
Coverage: 36 countries, largest first: the United States, India, Germany, Brazil, Türkiye, France, China, the United Kingdom, Italy, Spain and 26 more. Country and city lists for international patent law firms are linked below.
What qualifies: Companies worldwide 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.
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, 42,734 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 between September 4, 2026 and September 14, 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 location

73 lists · largest first

Every International patent law firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 worldwide?

RevenueBase identified 6,634 international patent law firms worldwide 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 country has the most international patent law firms?

The United States leads with 1,889 companies, followed by India (761) and Germany (491). Every international patent law firms list by country and city is linked on this page.

Which city has the most international patent law firms?

New Delhi leads with 168 headquartered companies, followed by Paris (159) and Sao Paulo (118).

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 42,734 verified decision-maker contacts tracked across these 6,634 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 4, 2026 and September 14, 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.