Hisako Tanaka

Ms. Tanaka has a wealth of experience at patent offices, where she has been involved in the preparation of application documents as well as inbound and outbound tasks and disputes. In particular, she has handled many cases in technical fields such as optical devices, image processing, communications, software and related subjects.

Ms. Tanaka is also a member of the Small and Medium-sized Venture Support Committee of the Kanto Japan Patent Attorneys Association, where she is actively involved in the dissemination of information on startups.

She prides herself on treating each and every case as a priority and offering services appropriate to the needs of her clients.


Patent Attorney




Japan Patent Attorneys Association

Areas of Legal Expertise

Patent and utility model applications, trials and appeals, expert opinions, and litigation

Areas of Technological Expertise

Electric Devices, Machinery, Control Devices

Professional Experience

2019 – present

Sonderhoff & Einsel, Law and Patent Office

2008 – 2018

Tani & Abe, p.c.

1999 – 2007

Domestic Patent Offices

1996 – 1999

Meitec Corporation



Faculty of Science, Ehime University, BA


“Start-ups and loss of novelty” (PATENT, Vol. 72 No.1 Japan Patent Attorneys Association, January 2019, Co-author)


Japanese, English