Company lists · Data refreshed September 2026

Top 23 International patent law firms based in Chicago, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 66 companies tracked

RevenueBase identified 66 international patent law firms headquartered in Chicago, United States as of September 2026 and tracks 3,634 professional contacts across them, including 2,295 with verified work emails. New York is the largest hub.

This list covers international patent law firms headquartered in Chicago, 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

66Companies

3,634Contacts tracked

2,295Verified emails

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The 23 largest international patent law firms based in Chicago, United States

Ranked by team size

Top 23 of 66 international patent law firms based in Chicago, 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	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
2	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
3	Mbhb Mcdonnell Boehnen Hulbert & Berghoff LLPIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	140
	“At MBHB, the legal and scientific credentials of our professionals are first rate.” Source: company website · checked Sep 4, 2026
4	Masuda FunaiPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	106
	“Since its founding in 1929, Masuda Funai has focused its practice on successfully representing international and domestic companies entering, operating and expanding in the United…” Source: company website · checked Sep 4, 2026
5	Greer, Burns & Crain, LTDIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	81
	“Greer Burns & Crain, Ltd.” Source: company website · checked Sep 4, 2026
6	Pattishall, Mcauliffe, Newbury, Hilliard & Geraldson LLPIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	45
	“Pattishall McAuliffe is one of the largest U.S.” Source: company website · checked Sep 4, 2026
7	Hanley, Flight & Zimmerman, LLCStrong evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	40
	“HFZ is a boutique IP law firm located in the heart of Chicago, specializing in United States and foreign patent prosecution and counseling.” Source: company website · checked Sep 4, 2026
8	Citius MindsPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	35
	“Citius Minds is a leading technology consulting firm supporting clients in advanced patent analytics and end to end patent litigation services.” Source: company website · checked Sep 4, 2026
9	Rakoczy Molino Mazzochi Siwik LLPPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	51-200	34
	“RMMS consists of over 30 attorneys focused exclusively on life sciences patent and regulatory counseling, patent litigation under Hatch-Waxman and the BPCIA, as well as post-grant…” Source: company website · checked Sep 4, 2026
10	Wood PhillipsStrong evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	27
	“Intellectual Property Law Firm Wood Phillips is adept at all aspects of intellectual property, both domestically and internationally, including patent application preparation and…” Source: company website · checked Sep 4, 2026
11	Saper LAW Offices, LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1-10	27
	“Saper Law is an intellectual property, social media, and business law firm with headline grabbing clients and cases.” Source: company website · checked Sep 4, 2026
12	Lempia Summerfield Katz LLCPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	25
	“Lempia Summerfield Katz LLC specializes in patents, trademarks, copyrights, and other aspects of intellectual property protection and counseling.” Source: company website · checked Sep 4, 2026
13	LEE Sullivan Shea & Smith LLPPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	19
	“LS3 is a full-service intellectual property law firm that caters to the special needs of its clients on an individual basis.” Source: company website · checked Sep 4, 2026
14	Cook Alex LTDPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	19
	“Cook Alex and its predecessors have a distinguished history of providing differentiated intellectual property legal services to a domestic and international client base.” Source: company website · checked Sep 4, 2026
15	Flener IP & Business LAWPartial evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	17
	“FLENER IP & Business Law is a WBE-Certified women-owned business.” Source: company website · checked Sep 4, 2026
16	Chip LAW GroupStrong evidence	Chicago, United StatesHQ checked Sep 4, 2026	11-50	15
	“CHIP LAW GROUP specializes in providing Intellectual Property (IP) Law services, with a special emphasis on obtaining Patents across a broad spectrum of technology areas.” Source: company website · checked Sep 4, 2026
17	IP SpringIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	12
	Source: company website · checked Sep 4, 2026
18	Klintworth & Rozenblat LLPIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	10
	“Klintworth & Rozenblat LLP is a legal services company based out of 19 N GREEN ST, Chicago, Illinois, United States.” Source: company website · checked Sep 4, 2026
19	Global IP LAW Group, LLCIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	10
	“Global IP has a singular focus: helping intellectual-property owners maximize value of their assets.” Source: company website · checked Sep 4, 2026
20	Kucala Burgett LAW LLCPartial evidence	Chicago, United StatesHQ checked Sep 4, 2026	1-10	9
	“Kucala Burgett Law acts as a strategic advisor to its clients and has extensive experience in trademark counseling, clearance, prosecution, enforcement, and litigation.” Source: company website · checked Sep 4, 2026
21	Whitewood LAW PllcIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1-10	8
	“Specializing in IP Disputes, Commercial Litigation & Arbitrations.” Source: company website · checked Sep 4, 2026
22	Vitale, Vickrey, Niro, Solon & Gasey LLPIndirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	11-50	7
	“Vitale, Vickrey, Niro & Gasey LLP specializes in solving complex intellectual property, business and commercial problems.” Source: company website · checked Sep 4, 2026
23	Elster & McgradyIndirect evidence	Chicago, United StatesHQ checked Sep 4, 2026	1-10	7
	“E&M is a boutique IP firm focusing on Brands, Domain Names/ICANN, Social Media, and related Litigation.” Source: company website · checked Sep 4, 2026

Showing 23 of 66 international patent law firms based in Chicago, United States

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International patent law firms based in Chicago, 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

1,001-5,000

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 Chicago, over 66 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 Chicago, 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 Chicago 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, 2,295 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

Frequently asked

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

RevenueBase identified 66 international patent law firms headquartered in Chicago, 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?

Banner Witcoff, headquartered in Chicago, 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 2,295 verified decision-maker contacts tracked across these 66 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 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.