Japan patent firms that work most with United States firms

Ranked by patent family observations each Japan firm shares with United States firms, 2013–2022. A family is counted once for each United States firm it was shared with, so the same family can appear more than once. Later years are left out because many filings are not published yet.

#	Firm	Family observations with United States firms	United States firms
1	SHIGA International Patent Office弁理士法人志賀国際特許事務所	14,620	909
2	Yamamoto Patent山本特許法律事務所	11,363	1,078
3	Sakai International Patent Office弁理士法人酒井国際特許事務所	9,643	302
4	ITOH International Patent Office弁理士法人ＩＴＯＨ	7,869	623
5	Seiwa Patent & Law Office Tokyo	7,282	731
6	Yuasa Hara	6,264	740
7	Soen International創英国際特許法律事務所	5,829	474
8	Nakamura Joint Patent & Law Office Tokyo中村合同特許法律事務所東京	5,633	792
9	KOTOBUKI Patent & Trademark Office	5,513	695
10	Taiyo International Patent	4,397	399
11	TMI Associates Osaka OfficeＴＭＩ総合法律事務所大阪オフィス	4,301	594
12	HIRAKI & ASSOCIATES弁理士法人平木国際特許事務所	4,238	498
13	ONDA TECHNO International Patent Attorneys弁理士法人オンダ国際特許事務所	4,224	496
14	Fukami Patent Office, P.C.弁理士法人深見特許事務所	4,118	419
15	Symphonia Intellectual Property Office清水　初志	4,104	469
16	Abe Ikubo Katayama Law	3,972	467
17	SUGIMURA & Partners	3,920	544
18	SONODA & KOBAYASHI園田・小林特許業務法人	3,493	401
19	AOYAMA & PARTNERS青山特許事務所	3,448	445
20	Tokyo Kyodo IP東京共同弁理士法人	3,243	423
21	Sonderhoff & Einsel Patent Law Officeゾンデルホフ＆アインゼル法律特許事務所	3,043	412
22	Kyowa Patent Law	2,845	333
23	Arai International Patent Office新居国際特許事務所	2,786	75
24	SUZUYE & SUZUYE弁理士法人鈴榮特許綜合事務所	2,669	279
25	Miyoshi Patent	2,493	346

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