Japan patent firms that work most with Europe firms

Ranked by patent family observations each Japan firm shares with Europe firms, 2013–2022. A family is counted once for each Europe 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 Europe firms	Europe firms
1	SHIGA International Patent Office弁理士法人志賀国際特許事務所	11,549	427
2	ITOH International Patent Office弁理士法人ＩＴＯＨ	5,751	234
3	Sakai International Patent Office弁理士法人酒井国際特許事務所	4,243	142
4	Seiwa Patent & Law Office Tokyo	4,113	299
5	Soen International創英国際特許法律事務所	3,913	211
6	Nakamura Joint Patent & Law Office Tokyo中村合同特許法律事務所東京	3,225	267
7	Fukami Patent Office, P.C.弁理士法人深見特許事務所	2,879	160
8	Sonderhoff & Einsel Patent Law Officeゾンデルホフ＆アインゼル法律特許事務所	2,799	268
9	KOTOBUKI Patent & Trademark Office	2,697	290
10	Yuasa Hara	2,685	224
11	Kyowa Patent Law	2,511	209
12	SUGIMURA & Partners	2,477	181
13	Taiyo International Patent	2,462	184
14	HIRAKI & ASSOCIATES弁理士法人平木国際特許事務所	2,365	197
15	SONODA & KOBAYASHI園田・小林特許業務法人	2,217	145
16	TMI Associates Osaka OfficeＴＭＩ総合法律事務所大阪オフィス	2,021	187
17	Axis International Patent Firmアクシス国際特許業務法人	1,950	143
18	ASAMURA PATENT OFFICE弁理士法人浅村特許事務所	1,696	280
19	AOYAMA & PARTNERS青山特許事務所	1,677	205
20	Morita Patent Office森田特許事務所	1,648	206
21	SAEGUSA & Partners	1,593	145
22	HARAKENZO WORLD PATENT & TRADEMARK特許業務法人HARAKENZO WORLD PATENT & TRADEMARK	1,591	150
23	Abe Ikubo Katayama Law	1,585	131
24	Anderson Mori & Tomotsuneアンダーソン・毛利・友常法律事務所外国法共同事業	1,483	77
25	SUZUYE & SUZUYE弁理士法人鈴榮特許綜合事務所	1,461	145

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