Patent Law Firm Directory

Leading patent law firms across IP5 jurisdictions — Korea, United States, Europe, Japan, and China — ranked by international case volume. Each firm profile surfaces public partner networks, exchange patterns, and flow direction.

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Global firm case index used for directory ranking. Not the same as a profile’s international exchange total.

#	Firm	Office	Index cases
1	Kim & Chang	South Korea	56,502
2	SHIGA International Patent Office 弁理士法人志賀国際特許事務所	Japan	43,173
3	Grünecker Grünecker Patent- und Rechtsanwälte	Europe	41,771
4	MERH-IP	Europe	36,259
5	Birch, Stewart, Kolasch & Birch, LLP	United States	31,756
6	Seiwa Patent & Law Office Tokyo	Japan	26,380
7	Hoffmann Eitle Patent- und Rechtsanwälte PartmbB	Europe	26,050
8	ITOH International Patent Office 弁理士法人ＩＴＯＨ (届出番号:G0458)	Japan	25,242
9	Marks & Clerk	Europe	23,913
10	Dehns	Europe	23,196
11	SUZUYE & SUZUYE 弁理士法人鈴榮特許綜合事務所 (届出番号:G0386)	Japan	21,901
12	Fish & Richardson	United States	21,590
13	Sakai International Patent Office 弁理士法人酒井国際特許事務所	Japan	21,461
14	Nakamura Joint Patent & Law Office Tokyo 中村合同特許法律事務所東京	Japan	21,158
15	Yamamoto Patent 山本特許法律事務所	Japan	20,729
16	Cantor Colburn LLP	United States	20,135
17	Sonderhoff & Einsel Patent Law Office ゾンデルホフ＆アインゼル法律特許事務所	Japan	19,889
18	Foley & Lardner	United States	19,178
19	Suzue International Patent Office 弁理士法人スズエ国際特許事務所	Japan	18,651
20	Lee International Patent Law Office 리인터내셔날특허법률사무소	South Korea	18,460
21	KOREANA Patent Firm 특허법인 코리아나	South Korea	18,272
22	Yuasa Hara	Japan	17,885
23	Vossius & Partner Patentanwälte Rechtsanwälte mbB	Europe	17,466
24	KOTOBUKI Patent & Trademark Office 山尾　憲人	Japan	17,127
25	D Young & Co LLP	Europe	15,625

1,178 firms · page 1 of 48

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