Company lists · Data refreshed September 2026

Top 25 Patent prosecution firms worldwide

Name: Patent prosecution firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 4,165 companies tracked

RevenueBase identified 4,165 patent prosecution firms worldwide as of September 2026 and tracks 54,788 professional contacts across them, including 24,209 with verified work emails. The United States is the largest market and New Delhi the largest hub.

This list covers patent prosecution 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 20, 2026. Country and city lists for patent prosecution 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 20, 2026 86% judged on-target in blind review

4,165Companies

54,788Contacts tracked

24,209Verified emails

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The 25 largest patent prosecution firms worldwide

Ranked by team size

Top 25 of 4,165 patent prosecution firms worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to patent prosecution 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	Fish & Richardson P.C	Partial evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,167 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 20, 2026
2	Finnegan, Henderson, Farabow, Garrett & Dunner, LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	501-1,000	936 contacts →
	Indirect evidence “When your most valuable assets are ideas, innovation, and brand-you need the best.” Source: RevenueBase Database · checked Sep 20, 2026
3	Maxval Group, INC	Indirect evidence	Los Altos, CA, United StatesHQ checked Sep 20, 2026	501-1,000	754 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 20, 2026
4	ROUSE	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	584 contacts →
	Indirect evidence “Rouse was established in the UK in 1990 and is recognised as a global intellectual property (IP) leader operating as a collaborative network with more than people working out of…” Source: RevenueBase Database · checked Sep 20, 2026
5	Marks & Clerk	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	573 contacts →
	Indirect evidence “We’re true specialists – focusing on IP and IP alone.” Source: RevenueBase Database · checked Sep 20, 2026
6	HGF Limited	Indirect evidence	Leeds, United KingdomHQ checked Sep 20, 2026	201-500	538 contacts →
	Indirect evidence “HGF is one of Europe’s largest firms of Intellectual Property specialists.” Source: RevenueBase Database · checked Sep 20, 2026
7	Smart & Biggar	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 20, 2026	501-1,000	521 contacts →
	Indirect evidence “Smart & Biggar is a Canadian intellectual property law firm.” Source: RevenueBase Database · checked Sep 20, 2026
8	Sagaciouselevate	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	501-1,000	488 contacts →
	Indirect 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 20, 2026
9	Anand And Anand	Indirect evidence	New Delhi, IndiaHQ checked Sep 20, 2026	201-500	482 contacts →
	Indirect 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 20, 2026
10	Sterne, Kessler, Goldstein & FOX	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	468 contacts →
	Indirect 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 20, 2026
11	K&s Partners	Indirect evidence	Gurugram, IndiaHQ checked Sep 20, 2026	201-500	454 contacts →
	Indirect 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 20, 2026
12	Wolf Greenfield	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	201-500	428 contacts →
	Indirect evidence “Wolf, Greenfield & Sacks, P.C.” Source: RevenueBase Database · checked Sep 20, 2026
13	ZACCO	Partial evidence	Copenhagen, DenmarkHQ checked Sep 20, 2026	501-1,000	386 contacts →
	Partial 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 20, 2026
14	Spruson & Ferguson	Indirect evidence	Sydney, AustraliaHQ checked Sep 20, 2026	201-500	369 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 20, 2026
15	Spoor & Fisher	Strong evidence	Pretoria, South AfricaHQ checked Sep 20, 2026	201-500	354 contacts →
	Strong evidence “Spoor & Fisher handles the filing, registration, prosecution and enforcement of trade marks, patents, designs and copyright.” Source: RevenueBase Database · checked Sep 20, 2026
16	Licks Attorneys	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 20, 2026	201-500	335 contacts →
	Indirect evidence “Licks Attorneys is a top-tier Brazilian law firm widely recognized for successfully handling large and strategic Intellectual Property, Life Sciences, Food & Drug, Regulatory…” Source: RevenueBase Database · checked Sep 20, 2026
17	AWA	Indirect evidence	Malmö, SwedenHQ checked Sep 20, 2026	201-500	324 contacts →
	Indirect evidence “We believe tomorrow is today’s emerging business – rising up from untapped potential within established industries and start-ups.” Source: RevenueBase Database · checked Sep 20, 2026
18	Plasseraud IP	Indirect evidence	Paris, GermanyHQ checked Sep 20, 2026	201-500	318 contacts →
	Indirect evidence “Founded in 1906, Plasseraud IP is one of the leading European firms in the IP sector, and among the largest in France.” Source: RevenueBase Database · checked Sep 20, 2026
19	Merchant & Gould P.C	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	201-500	317 contacts →
	Partial 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 20, 2026
20	Banner Witcoff	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	288 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 20, 2026
21	Schwegman Lundberg & Woessner, P.A	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	201-500	275 contacts →
	Indirect evidence “SLW is a boutique law firm dedicated to protecting intellectual property.” Source: RevenueBase Database · checked Sep 20, 2026
22	Lexorbis	Indirect evidence	New Delhi, IndiaHQ checked Sep 20, 2026	51-200	275 contacts →
	Indirect evidence “LexOrbis is a premier IP-Boutique firm based at New Delhi, India.” Source: RevenueBase Database · checked Sep 20, 2026
23	Harness IP	Partial evidence	Bloomfield Hills, MI, United StatesHQ checked Sep 20, 2026	201-500	266 contacts →
	Partial evidence “Harness IP’s team of patent and trademark attorneys serve clients in all areas of intellectual property law.” Source: RevenueBase Database · checked Sep 20, 2026
24	Kasznar Leonardos	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 20, 2026	201-500	258 contacts →
	Indirect evidence “Innovators by nature, we seek to apply creativity and multidisciplinary approach to various projects.” Source: RevenueBase Database · checked Sep 20, 2026
25	Effectual Services	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	242 contacts →
	Partial evidence “Effectual Services is a well established and fast growing patent and legal support services company having experience and expertise in providing patent and legal services.” Source: RevenueBase Database · checked Sep 20, 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: patent prosecution 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 patent prosecution firms.
Partial evidence: Its own public description names part of patent prosecution firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name patent prosecution 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 4,165 patent prosecution firms worldwide

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Patent prosecution firms worldwide at a glance

As of Sep 20, 2026

44.2%Verified-email coverage

13.2Average contacts per company

1-10Median size (employees)

1.8%Largest-city concentration · New Delhi

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

2,380

11-50

1,273

51-200

371

201-500

101

501-1,000

1,001-5,000

10001+

Email recency is reported on each country list linked below.

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 patent prosecution 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: Every country. Country and city lists for patent prosecution firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “patent prosecution 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 patent prosecution 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 patent prosecution 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, 24,209 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 20, 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.

Patent prosecution firms by location

25 lists · largest first

Every Patent prosecution 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 patent prosecution 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 patent prosecution firms are there worldwide?

RevenueBase identified 4,165 patent prosecution 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?

Fish & Richardson P.C, headquartered in Boston, tops this list with the largest team on record.

Which country has the most patent prosecution firms?

The United States leads with 1,382 companies, followed by India (387) and Germany (351). Every patent prosecution firms list by country and city is linked on this page.

Which city has the most patent prosecution firms?

New Delhi leads with 77 headquartered companies, followed by Munchen (68) and Washington (62).

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 24,209 verified decision-maker contacts tracked across these 4,165 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 20, 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.