Patent, including Design Patent, Trademark, Copyright, Unfair Competition, Geographical Identification,
Japanese & international prosecution, opposition, cancellation, and litigation

Forwarding ahead, with sound IP

We represent many of Japanese and International leading companies, including Panasonic, Nichia Corporation, Otsuka Pharmaceutical Factory, Keyence, and more. Not only drafting claims, we are especially focusing on proposing alternative way of protection, such as avoiding prior art or adding/simplifying structure.

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Jeffrey R. Filipek, Esq. Partner

Wenderoth, Lind & Ponack, L.L.P.

“Mr. Yasushi Toyosu is a thoughtful and dedicated patent attorney. He sees the big picture and does what is best for his clients. He is always striving to learn through his own studies and by connecting with people via his involvement with intellectual property associations in Japan and the U.S. I had the memorable pleasure of working closely with Mr. Toyosu at the Wenderoth firm in Washington DC, where I have been practicing for over 20 years. Mr. Toyosu’s reputation was helpful for our firm’s effort in connecting with existing and potential clients to share and discuss developments in US patent law. I am thankful to have him as a colleague and friend.”



•Established in 1971 in Tokushima •Member of Japan Patent Attorney Association (JPAA) •Supporting member of Japan Intellectual Property Association (JIPA) •Member: 14 •Patent Attorney: 4

◆ Yasushi Toyosu

•Electrical and Mechanical Engineering, Software, IT, IoT, FA, Imaging

Mr. Yasushi Toyosu is managing partner of Toyosu & Co.
He has Ph.D degree of engineering at Tokushima University, and Master degree at Osaka City University Graduate School.

◆ Yasuhiro Toyosu

•Electrical and Mechanical Engineering, Circuitry, Batteries

Mr. Yasuhiro Toyosu is founder and chief executive partner. He has more than 50 year experience of patent prosecution.

◆ Ken Toyosu

•Electrical and Mechanical Engineering, Circuitry, Batteries

Mr. Ken Toyosu is born and grown up in Tokushima, Japan.  He has been an exchange student in California, U.S. and speaks fluent English.  He graduated Tokushima University, Engineering facauty in 1993.  After his extensive dedication to front-line human education and farmwork, he registerd a Japanese patent attorney in 2020.

1-5-6, Kanazawa, Tokushima-c, Tokushima 770-0871 JAPAN(Googlemap)

TEL:+81 (0) 88-664-2277
FAX:+81 (0) 88-664-1335

We always welcome inquiries from our customers. If you have any questions, please feel free to contact us.


JPAA Shikoku