Company lists · Data refreshed September 2026
Top 25 Patent law firms based in Chicago, United States
RevenueBase identified 72 patent law firms headquartered in Chicago, United States as of September 2026 and tracks 1,880 professional contacts across them, including 1,070 with verified work emails. New York is the largest hub.
This list covers 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 5, 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.
The 25 largest patent law firms based in Chicago, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 288 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 213 | ||||
“Marshall, Gerstein & Borun LLP has one focus - intellectual property law.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 162 | ||||
“McAndrews, Held & Malloy is a premier, full-service intellectual property and technology law firm.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 157 | ||||
“Leydig, Voit & Mayer remains at the forefront of intellectual property law, providing advice and counsel in intellectual property litigation, licensing, and prosecution services…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 143 | ||||
“At MBHB, the legal and scientific credentials of our professionals are first rate.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 109 | ||||
“With over 160 years of experience, Fitch, Even, Tabin & Flannery LLP is Chicago’s oldest law firm in continuous practice and a national leader in the field of intellectual…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 80 | ||||
“Greer Burns & Crain, Ltd.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 44 | ||||
“Pattishall McAuliffe is one of the largest U.S.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | Rakoczy Molino Mazzochi Siwik LLPPartial evidence | 35 | |||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 28 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 28 | ||||
“Saper Law is an intellectual property, social media, and business law firm with headline grabbing clients and cases.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Irwin IP Llp, A Part Of Miller JohnsonIndirect evidence | 26 | |||
“Irwin IP, a part of Miller Johnson, focuses exclusively on intellectual property and technology-related litigation.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 25 | ||||
“Lempia Summerfield Katz LLC specializes in patents, trademarks, copyrights, and other aspects of intellectual property protection and counseling.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 22 | ||||
“Chapman Spingola is a nationally recognized, boutique law firm leveraging its large-firm experience and results-driven approach for clients ranging from small businesses to…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 20 | ||||
“FLENER IP & Business Law is a WBE-Certified women-owned business.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 12 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 11 | ||||
“AddyHart is a boutique law firm focused on intellectual property litigation and corporate law.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 11 | ||||
“Arch & Lake LLP is a law firm founded in 2018 with offices in Bellevue, Chicago, and Houston.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 10 | ||||
“Global IP has a singular focus: helping intellectual-property owners maximize value of their assets.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 72 patent law firms based in Chicago, United States
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Patent law firms based in Chicago, United States at a glance
As of Sep 5, 2026Companies by employee count
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 72 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 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 “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 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, 1,070 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 5, 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 law firms by metro in the United States
- Patent law firms in New York114
- Patent law firms in Washington82
- Patent law firms in Chicago72
- Patent law firms in Los Angeles55
- Patent law firms in Houston52
- Patent law firms in Dallas50
- Patent law firms in Atlanta45
- Patent law firms in Austin43
- Patent law firms in San Diego38
- Patent law firms in San Francisco35
- Patent law firms in Irvine32
- Patent law firms in Seattle30
- Patent law firms in Alexandria29
- Patent law firms in Minneapolis29
- Patent law firms in Boston27
- Patent law firms in Miami26
Frequently asked
How many patent law firms are there based in Chicago, United States?
RevenueBase identified 72 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 patent law firms?
New York leads with 114 headquartered companies, followed by Washington (82) and Chicago (72).
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 1,070 verified decision-maker contacts tracked across these 72 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 5, 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.