The following table shows the ranking of United States IP law firm. The ranking is based on the following conditions.

  • Technical field:  Heat exchange (air-conditioning apparatus, heat pump system, heat sink, liquid cooling system, gas turbine engine, heat engine system for generating electricity, etc.)
  • Status:  United States granted patents in 2018 (registration date).
  • Count:  The number of patents represented by each United States IP law firm, attorney or agent was counted.  Even if attorney or agent belongs to a law firm, they were counted separately.
RankingNo.IP law firm
180Posz Law Group
254Harness Dickey & Pierce
351Oblon McClelland Maier & Neustadt
445Cantor Colburn
532Howard & Howard Attorneys
629Buchanan Ingersoll & Rooney
729Birch Stewart Kolasch & Birch
827Carlson Gaskey & Olds
926McDermott Will & Emery
1026Muncy Geissler Olds & Lowe
1125James D Miller
1223Shumaker Loop & Kendrick
1323Baker Botts
1423Marshall & Melhorn
1520KED & Associates
1619Sughrue Mion
1719Foley & Lardner
1819Fish & Richardson
1918Crowell & Moring
2018Dority & Manning
In preparing the table, a patent search expert conducted a patent search using patent classification and keywords (as necessary) in order to extract patents in specific technical field (here, Heat exchange field).
In the patent search, it was confirmed that a high-accuracy population (i.e., a population not including non-relevant fields) of patents was obtained. Subsequently, the population was used to create the table.

By entering the Firm name in the "Attorney or Agent" column of USPTO database, you can find the patent information handled by each Firm.

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