Company lists · Data refreshed September 2026
Top 25 Patent law firms based in New York, United States
RevenueBase identified 114 patent law firms headquartered in New York, United States as of September 2026 and tracks 1,804 professional contacts across them, including 755 with verified work emails. New York is the largest hub.
This list covers patent law firms headquartered in New York, 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 New York, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Effectual ServicesPartial evidence | 242 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 182 | ||||
“Fross Zelnick is consistently recognized by clients and peers as one of the top IP law firms in the world.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 140 | ||||
“Desmarais LLP is a leading intellectual property litigation firm with offices in New York, San Francisco, and Washington, D.C.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 135 | ||||
“As an enterprise grows, its need for intellectual property (IP) protection expands.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Kenyon & Kenyon LLPPartial evidence | 117 | |||
“Kenyon & Kenyon LLP is a leading intellectual property law firm whose sophisticated and business-oriented approach helps clients succeed with their intellectual property…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 100 | ||||
“HG Law LLP (formerly Haley Guiliano LLP) is an international intellectual property law firm specializing in patent law from offices in London, New York and Silicon Valley.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 94 | ||||
“We are a boutique full-service firm recognized worldwide in the areas of intellectual property law and litigation.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 85 | ||||
“Since 1953, Amster, Rothstein & Ebenstein LLP has focused exclusively on representing clients in all facets of intellectual property law both domestically and internationally.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 81 | ||||
“For over 25 years, Haug Partners has provided synthesized multidisciplinary legal services for life science and technology businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 34 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Lucas & Mercanti LLPPartial evidence | 28 | |||
“Lucas & Mercanti is an intellectual property law firm.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 26 | ||||
“Ostrolenk Faber is a premier intellectual property boutique law firm.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 23 | ||||
“Epstein Drangel LLP is a leading intellectual property law firm.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 21 | ||||
“Gemini’s life sciences lawyers are among the most experienced and successful at helping manufacturers of biopharma products navigate IP barriers to access the U.S.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | Notaro, Michalos & Zaccaria P.CIndirect evidence | 21 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 17 | ||||
“Large publicly traded companies and cutting-edge startups trust Gish PLLC to handle their most intricate IP matters.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 14 | ||||
“Handal & Morofsky, LLC is a boutique law firm focusing on intellectual property and internet law.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | FAY Kaplun & Marcin, LLPStrong evidence | 12 | |||
“Fay Kaplun & Marcin, LLP specializes in Intellectual Property (IP) Law, assisting clients with identifying, analyzing and protecting IP, including patents, trademarks, copyrights…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Leichtman LAW PllcPartial evidence | 11 | |||
“Leichtman Law is a boutique trial firm formed by a group of like-minded experienced litgators who advocate for our clients in business and intellectual property cases, or pursue…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Levy Goldenberg LLPIndirect evidence | 9 | |||
“Levy Goldenberg LLP is a leading litigation practice representing businesses of all sizes in the New York Metropolitan Area.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Zeisler PllcPartial evidence | 9 | |||
“Our law firm is comprised of highly accomplished and experienced lawyers who have particular expertise in complex business and intellectual property matters.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | Lombard Geliebter & CohenPartial evidence | 9 | |||
“LGC is a New York City-based boutique law firm specializing in intellectual property litigation, prosecution, and related business and technology matters.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | Radulescu LLPPartial evidence | 8 | |||
“Radulescu LLP is a patent litigation firm that specializes in cases where a deep understanding of the interplay between technology and legal issues is critical to a company’s…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | Whitewood LAW PllcIndirect evidence | 8 | |||
“Specializing in IP Disputes, Commercial Litigation & Arbitrations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Powley & Gibson, P.CIndirect evidence | 8 | |||
“Our firm advises and counsels clients on a wide range of intellectual property issues in various industries, including pharmaceutical, retail, food services, publishing, apparel…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 114 patent law firms based in New York, United States
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Patent law firms based in New York, 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 New York, over 114 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 New York, 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 New York 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, 755 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 New York, United States?
RevenueBase identified 114 patent law firms headquartered in New York, 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?
Effectual Services, headquartered in New York, 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 755 verified decision-maker contacts tracked across these 114 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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Patent law firms by geography
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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.