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A New Kind

Of Agency.


We acquire patent rights with accurate understanding, logical thinking and communication skills. Boost your business to infinity !

 Katsunuma International Patent Office is a patent office that opened in January 2017.

 Although the office is new, I has been involved in patent work for nearly 30 years.

 My belief  of doing my best for the clients has never changed all the way.

 After working in a large firm as its president,  I opened my own firm as I believe a patent firm should meet the demand of the times.

 The service of a pant firm of today must be quick, flexible and attentive.

 The fruits of intellectual properties depends on the spirit and capability of the patent attorneys you choose.


 Please try us! I am looking forward to the exciting encounter with you,

hoping I can do something for you.


Please feel free to contact us.


Sincerely yours,


What's New

【Articles】 "Examination Handbook Revision Related IoT Technology" posted by Mr. Katsunuma on AIPPI e-News No. 54 was published.

July 27, 2017

【Sapporo】Jointed APAA(Asian Patent Attorneys Association) Joint JP/KR/AU Patent Committee Meeting

June 27, 2017

【Taipei】Jointed APAA(Asian Patent Attorneys Association) TW/JP Joint Meeting

June 01, 2017

【Cheju】Jointed AIPPI(International Association for the Protection of Intellectual Property)JP/CN/KR Seminar

April 20, 2017

【Manila】Jointed ASEAN IPA(ASEAN Intellectual Property Association) 21nd ASEAN Intellectual Property Association

Annual Meeting & Conference

April 03, 2017

【Arlington】Jointed ABA(American Bar Association) 32nd Annual Intellectual Property Law Conference

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Katsunuma International Patent Office   Hiro Tokyo IP 


Tel: (81)3-6435-5871    Fax: (81)3-6435-5872

Modern-Form II 4F, Nishi-Azabu 1-15-7, Minato-ku, Tokyo,106-0031, Japan

6 min walk from Nogizaka Sta. Tokyo Metro Chiyoda-Line
9 min walk from Roppongi Sta. Tokyo Metro Hibiya-Line/Oedo-Line
3 min walk from Nishi-Azabu Bus Stop Toei Bus

Please feel free to contact us!

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