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Japan Patent Attorneys and IP Law Firms

300 Japan patent firms, ordered by shared patent families. Open a firm to see the firms it works with in other countries.

Yearly counts since 1990, added up. One family can be counted more than once.

How firms are counted
Who is listed
Firms at the IP5 offices with at least 500 shared patent families since 1990 (yearly counts, added up). Individual representatives and smaller firms are not listed.
Default order
By shared patent families. One family can be counted under several firms and years; this order does not measure firm quality or market share.
Profile totals
Profile totals use the counting basis stated beside each metric. Families can appear in several groups or years, so profile and directory totals can differ.
Signed-in analysis
Uses the filing years and filters you choose, so its counts can differ from these public totals.
#FirmShared patent families
1SHIGA International Patent Office
弁理士法人志賀国際特許事務所
43,529
2Seiwa Patent & Law Office Tokyo26,423
3ITOH International Patent Office
弁理士法人ITOH
25,273
4SUZUYE & SUZUYE
弁理士法人鈴榮特許綜合事務所
21,920
5Sakai International Patent Office
弁理士法人酒井国際特許事務所
21,506
6Nakamura Joint Patent & Law Office Tokyo
中村合同特許法律事務所 東京
21,190
7Yamamoto Patent
山本特許法律事務所
20,775
8Sonderhoff & Einsel Patent Law Office
ゾンデルホフ&アインゼル法律特許事務所
19,992
9Suzue International Patent Office
弁理士法人スズエ国際特許事務所
18,666
10Yuasa Hara17,905
11KOTOBUKI Patent & Trademark Office17,141
12Soen International
創英国際特許法律事務所
15,065
13Nogawa Patent Office13,687
14Fukami Patent Office, P.C.
弁理士法人深見特許事務所
13,079
15中村誠特許事務所12,776
16AOYAMA & PARTNERS
青山特許事務所
11,564
17TANI & ABE, p.c.
特許業務法人 谷・阿部特許事務所
11,446
18ONDA TECHNO International Patent Attorneys
弁理士法人オンダ国際特許事務所
11,374
19Taiyo International Patent10,888
20TMI Associates Osaka Office
TMI総合法律事務所 大阪オフィス
9,879
21SONODA & KOBAYASHI
園田・小林特許業務法人
9,818
22OHTSUKA PATENT OFFICE
弁理士法人大塚国際特許事務所
9,765
23HIRAKI & ASSOCIATES
弁理士法人平木国際特許事務所
9,636
24ASAMURA PATENT OFFICE
弁理士法人浅村特許事務所
9,577
25Kyowa Patent Law9,083

300 firms · page 1 of 12

All 300 Japan firms in this directory

Hiring a patent attorney in Japan

The Japan Patent Office (JPO) examines applications in Japanese. An applicant with no domicile or residence in Japan (for a company, no business office) handles most procedures through a patent administrator in Japan, usually a Japanese patent attorney or benrishi (Patent Act, Article 8).

So a firm abroad usually files and prosecutes through a Japanese patent attorney. This directory lists 300 Japanese firms, ordered by the patent families each shares with firms in other countries. The most active are SHIGA International Patent Office, Seiwa Patent & Law Office Tokyo and ITOH International Patent Office.

To shortlist, open the ranking for your own country below: it lists the Japan firms that already work most with firms there.

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