Japan patent firms that work most with China firms

Ranked by patent family observations each Japan firm shares with China firms, 2013–2022. A family is counted once for each China 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 China firms	China firms
1	SHIGA International Patent Office弁理士法人志賀国際特許事務所	56,238	2,299
2	ITOH International Patent Office弁理士法人ＩＴＯＨ	22,323	1,544
3	Sonderhoff & Einsel Patent Law Officeゾンデルホフ＆アインゼル法律特許事務所	20,886	772
4	Seiwa Patent & Law Office Tokyo	17,876	1,366
5	Sakai International Patent Office弁理士法人酒井国際特許事務所	16,217	879
6	Fukami Patent Office, P.C.弁理士法人深見特許事務所	13,880	1,075
7	Nakamura Joint Patent & Law Office Tokyo中村合同特許法律事務所東京	13,622	1,286
8	Soen International創英国際特許法律事務所	13,524	1,163
9	Yuasa Hara	12,802	1,194
10	SUZUYE & SUZUYE弁理士法人鈴榮特許綜合事務所	12,486	798
11	Kyowa Patent Law	11,928	956
12	KOTOBUKI Patent & Trademark Office	11,862	1,403
13	Taiyo International Patent	11,832	1,107
14	SUGIMURA & Partners	11,781	1,180
15	TMI Associates Osaka OfficeＴＭＩ総合法律事務所大阪オフィス	11,190	1,221
16	Morita Patent Office森田特許事務所	10,115	604
17	SHINSEI Patent OfficeＳＨＩＮＳＥＩ特許事務所	9,918	254
18	HIRAKI & ASSOCIATES弁理士法人平木国際特許事務所	9,741	879
19	SONODA & KOBAYASHI園田・小林特許業務法人	9,034	697
20	ASAMURA PATENT OFFICE弁理士法人浅村特許事務所	8,694	1,111
21	Yamamoto Patent山本特許法律事務所	8,553	1,052
22	Suzue International Patent Office弁理士法人スズエ国際特許事務所	8,149	537
23	RYUKA & PARTNERS龍華国際特許業務法人	8,087	922
24	GPOJ Patent FirmＧＰＯＪ特許事務所	7,698	128
25	AOYAMA & PARTNERS青山特許事務所	7,553	995

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