Japan patent firms that work most with South Korea firms

Ranked by patent family observations each Japan firm shares with South Korea firms, 2013–2022. A family is counted once for each South Korea 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 South Korea firms	South Korea firms
1	SHIGA International Patent Office弁理士法人志賀国際特許事務所	10,493	199
2	Seiwa Patent & Law Office Tokyo	4,173	104
3	ITOH International Patent Office弁理士法人ＩＴＯＨ	3,012	172
4	Soen International創英国際特許法律事務所	2,929	97
5	Sakai International Patent Office弁理士法人酒井国際特許事務所	2,424	66
6	Fukami Patent Office, P.C.弁理士法人深見特許事務所	1,920	102
7	Taiyo International Patent	1,880	142
8	SUGIMURA & Partners	1,663	91
9	TMI Associates Osaka OfficeＴＭＩ総合法律事務所大阪オフィス	1,569	83
10	KOTOBUKI Patent & Trademark Office	1,561	119
11	Nakamura Joint Patent & Law Office Tokyo中村合同特許法律事務所東京	1,491	110
12	Kyowa Patent Law	1,438	107
13	RYUKA & PARTNERS龍華国際特許業務法人	1,343	100
14	UNIUS Patent Attorneys Office弁理士法人ユニアス国際特許事務所	1,337	93
15	Yamamoto Patent山本特許法律事務所	1,273	72
16	Yuasa Hara	1,185	80
17	ONDA TECHNO International Patent Attorneys弁理士法人オンダ国際特許事務所	1,160	76
18	Otani Patent Office弁理士法人大谷特許事務所	1,041	33
19	AOYAMA & PARTNERS青山特許事務所	1,031	96
20	SONODA & KOBAYASHI園田・小林特許業務法人	972	65
21	Shobayashi International Patent and Trademark Office, P.C.弁理士法人正林国際特許商標事務所	931	88
22	HIRAKI & ASSOCIATES弁理士法人平木国際特許事務所	919	88
23	Cycks Patent Firm特許業務法人特許事務所サイクス	912	39
24	Ohno Law Offices大野総合法律事務所	907	58
25	SAEGUSA & Partners	896	82

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