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United States Patent Attorneys and IP Law Firms

525 United States patent firms, ordered by shared patent families. Open a firm to see the firms it works with in other countries.

Yearly counts since 1990, added up. One family can be counted more than once.

How firms are counted
Who is listed
Firms at the IP5 offices with at least 500 shared patent families since 1990 (yearly counts, added up). Individual representatives and smaller firms are not listed.
Default order
By shared patent families. One family can be counted under several firms and years; this order does not measure firm quality or market share.
Profile totals
Profile totals use the counting basis stated beside each metric. Families can appear in several groups or years, so profile and directory totals can differ.
Signed-in analysis
Uses the filing years and filters you choose, so its counts can differ from these public totals.
#FirmShared patent families
1Oblon McClelland53,655
2Sughrue Mion42,068
3Oliff PLC33,881
4Birch, Stewart, Kolasch & Birch, LLP32,228
5Fish & Richardson21,700
6Harness Dickey20,981
7Cantor Colburn LLP20,383
8Foley & Lardner19,218
9Nixon Vanderhye18,081
10Knobbe Martens17,141
11Finnegan Henderson15,572
12Wenderoth Lind & Ponack14,374
13Buchanan Ingersoll Rooney14,095
14McDermott Will Emery14,068
15Kilpatrick Townsend & Stockton LLP13,116
16Morgan Lewis & Bockius13,107
17Westerman, Hattori, Daniels & Adrian, LLP10,257
18Brinks Hofer Gilson & Lione10,125
19Fitzpatrick, Cella, Harper & Scinto10,124
20Leydig Voit Mayer10,042
21Greenblum Bernstein9,803
22Staas & Halsey9,774
23Osha Liang9,410
24Young & Thompson9,408
25ArentFox Schiff9,307

525 firms · page 1 of 21

All 525 United States firms in this directory

Hiring a patent attorney in the United States

The USPTO examines US patent applications in English. Representing others before it in patent matters is generally limited to the patent attorneys and agents on its register (37 CFR 11.10).

So a firm abroad usually files and prosecutes through a registered US patent attorney or agent. This directory lists 525 US firms, ordered by the patent families each shares with firms in other countries. The most active are Oblon McClelland, Sughrue Mion and Oliff PLC.

To shortlist, open the ranking for your own country below: it lists the United States firms that already work most with firms there.

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