Managing Partner	Yasunori Ohtsuka
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts and Customs (seizure of IP-infringing products at the customs offices); legal opinions on infringement and validity; particular experience in the area of business equipment, telecommunications and medical equipment.
Education	B.A., Chuo University, Law Diploma, Tokyo Electric University, School of Electronics
Career	Admitted to practice as a Japanese Patent Attorney in 1972. Worked as a Patent Attorney for Burroughs Japan prior to founding the Ohtsuka Patent Office. Brought the Office into the top twenty Patent Law Firms in Japan, and, in particular, into the top ten Patent Law Firms in the fields of electronics and physics.
Membership(s)	Member of Japan Patent Attorneys Association and other professional associations such as AIPPI , APAA and Institute of Intellectual Property; Chairman of the Japan/US Study Group at JPAA/AIPLA, Vice-President of LES
Publication(s)	Practical Advice on Patents (co-author; published by Ohm); The Basics of Patents (published by Ohm); Protecting Intellectual Property in Japan (AIPPI Japan); Trial/Appeal Procedure in the U.S. and in European Countries (Gyosei); Editor of Review of the CAFC’s Decisions (published by ILS)

Patent Attorney	Yasuhiro Ohtsuka, Ph.D. (Partner)
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts and Customs; legal opinions on infringement and validity; particular experience in image processing, mobile communications and Internet, information technologies (both hardware and software), semiconductors and electronic devices.
Education	M.S., The University of Tokyo, Electronic and Information Engineering Ph.D., The University of Tokyo, Electronic Engineering (with emphasis on CMOS image sensors and image processing)
Career	Co-researcher in telecommunication systems at the Hattori Research Laboratory; Postdoctoral Fellowship from the Japan Society for the Promotion of Science (JSPS) in the field of Mathematical, Physical and Engineering Science. Japanese Patent Attorney since 1999.
Membership(s)	Japan Patent Attorneys Association (JPAA), The Imaging Society of Japan, Information and Communication Engineers
Publication(s)	Numerous academic papers published through academic associations, such as the IEEE; The Basics of Patents (co-author; published by Ohm); contributes CAFC reports to The Lawyers (monthly journal)

Patent Attorney	Jiro Takayanagi　（Partner）
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts and Customs; legal opinions on infringement and validity; particular experience in the area of mobile communications, ATM switches, Internet-related communications, information processing technology and optical communications.
Education	B.S., Keio University, Electrical Engineering M.S., Keio University, Electrical Engineering (with emphasis on telecommunications)
Career	Japanese Patent Attorney since 1998. Patent Attorney, Hitachi, Information Systems Group and Intellectual Property Group. Lecturer in Intellectual Property at Keio University.
Membership(s)	Japan Patent Attorneys Association (JPAA), AIPPI
Publication(s)	The Basics of Patents (co-author; published by Ohm); contributes CAFC reports to The Lawyers (monthly journal)

Patent Attorney	Shuji Kimura　（Partner）
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts and Customs; legal opinions on infringement and validity; particular experience in Customs proceedings and also in the fields of automobile, industrial machinery, semiconductor production equipment, and amusement software fields.
Education	B.S., Mechanical Engineering, Waseda University
Career	Japanese Patent Attorney since 2000. Engineer, Tokyo R&D Corporation, specializing in electric power assisted steering systems. Actively handling Boards of Appeal and IP High Court cases.
Membership(s)	Japan Patent Attorneys Association (JPAA), the Customs Intellectual Property Information Center (CIPIC)
Publication(s)	The Basics of Patents（co-author; published by Ohm); contributes CAFC reports to The Lawyers (monthly journal)

Patent Attorney	Osamu Shimoyama　（Partner）
Specialties	Patent and design practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts and Customs; legal opinions on infringement and validity; particular experience in computer software and hardware-related inventions and telecommunications.
Education	B.S., University of Electro-Communications, Computer Science
Career	Japanese Patent Attorney since 2003. Active in the patent field since 1990. Worked for NCR Japan as a software and firmware engineer.
Membership(s)	Japan Patent Attorneys Association (JPAA), The Institute of Electronics, Information and Communication Engineers

Patent Attorney	Yukimitsu Eikawa　（Partner）
Specialties	Patent and design practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the area of semiconductor technology, semiconductor production equipment and computer hardware and software.
Education	B.S., Tokyo Agriculture and Technology University, Electrical Engineering
Career	Japanese Patent Attorney since 2004. Active in the patent field since 1995. Worked in the LSI Division of JFK Steel Corporation, designing microprocessors. Special expertise in semiconductor technology.
Membership(s)	Japan Patent Attorneys Association (JPAA), Institute of Intellectual Property
Publication(s)	The Basics of Patents (co-author; published by Ohm)

Patent Attorney Principal	Yoshio Nishikawa
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity in chemical, pharmaceutical and medical fields; particular experience in appeals before the Board of Appeal and IP High Court.
Education	B.S., Kyoto University, Polymer Chemistry M.S., Kyoto University, Polymer Chemistry
Career	Qualified as a Japanese Patent Attorney in 1983. Worked for the Japan Patent Office as a Patent Examiner in the fields of Polymers, Textiles and Paper Manufacturing Machinery, and also worked as a Board of Appeal Chief Examiner in various technical fields.
Membership(s)	Japan Patent Attorneys Association (JPAA), Society of Polymer Science, Japan
Publication(s)	Technical Revolution and Patent System (published by JPO)

Patent Attorney Principal	Kiyohito Ejima
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in the fields of information and communication technologies.
Education	B.S., Waseda University, Electronicｓ, Information and Telecommunications
Career	Qualified as a Japanese Patent Attorney in 1990. Worked for the Japan Patent Office as: a) Patent Examiner in the fields of Electronic Circuits and Digital Communications, b) Appeal Examiner (Digital communications), c) Director of Examinations in the divisions of Digital communications, Electronic Image Devices and Electronic Commerce, and d) Director of the Board of Appeals (Interface and Transmission Systems).
Membership(s)	Japan Patent Attorneys Association (JPAA) Executive Director at Japan Intellectual Property Association (JPAA)

Patent Attorney	Junjiro Yashiro
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in opinion works and patent licensing in the Pharmaceutical and Biotechnology fields.
Education	B.S., Tohoku Pharmaceutical University
Career	Japanese Patent Attorney since 1970. Worked for Eisai Pharmaceutical Company as Patent Attorney and Director of the Intellectual Property Division.
Membership(s)	Vice-chairman of the Health Care Products Committee of LES International, Vice-President of LES Japan, Member of the Board of Directors (Pharmaceutical and Chemical Industry section) of JIPA

Patent Attorney	Yasuhiro Sakata (Partner)
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the areas of Internet technology, telecomunications and mobile communications.
Education	B.S., The University of Tokyo, Electronic and Information Engineering M.S., The University of Tokyo, Electronic Engineering
Career	Japanese Patent Attorney since 2004. Conducted study on information technology with an emphasis on the fields of Internet search engines, web applications and artificial intelligence.
Membership(s)	Japan Patent Attorneys Association (JPAA), The Institute of Electronics, Information and Communication Engineers

Patent Attorney	Takashi Sakamoto
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in the fields of telecommunications, image processing and optical recording technologies.
Education	B.S., Electronics, Kobe University
Career	Japanese Patent Attorney since 2004. Worked for International Digital Communications Inc. as a transmission engineer in the field of core network design.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Takahiro Ohto (Partner)
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the fields of image processing, computing and telecommunications.
Education	B.S., University of Tokyo, Mathematical Informatics M.S., University of Tokyo, Mathematical Informatics
Career	Active in the patent field since 2007, Japanese Patent Attorney since 2009. Worked for IBM Japan Ltd. as Technical Sales Support Engineer for Storage Products.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Nobuyoshi Yarita
Specialties	Patent and design practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in the fields of image processing, and input and output devices for computers.
Education	B.S., Sophia University, Mechanics M.S., Sophia University, Mechanics
Career	Active in the patent field since 1997, Japanese Patent Attorney since 2010. Worked for Toshiba Corporation as a computer engineer for Space Robotics Systems.
Membership(s)	Japan Patent Attorneys Association (JPAA), The Institute of Electronics, Information and Communication Engineers

Patent Attorney	Koji Maeda (Partner)
Specialties	Patent practice before Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the areas of wireless communication, signal processing and information theory.
Education	B.Eng., Tokyo Institute of technology, Electrical and Electronic Engineering M.Eng., Tokyo Institute of technology, Electrical and Electronic Engineering
Career	JJapanese Patent Attorney since 2010. Worked for NTT DOCOMO as researcher at R&D. Developed interference canceller for mobile and fixed wireless communication systems, and cognitive radio techniques.
Membership(s)	Japan Patent Attorneys Association (JPAA) IEEE (Communication society)

Patent Attorney	Haruhito Yoshida, Ph.D.
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in digital mobile communication systems and related technologies.
Education	M.S., Waseda University, Electronics, Information and Telecommunication Engineering Ph.D., Waseda University, Electronics, Information and Telecommunication Engineering
Career	Japanese Patent Attorney since 2010. Research Associate, Waseda University. Visiting Research Associate, Waseda University. Worked for the Japan Patent Office as a researcher.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Hideo Sugawara
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the areas of control engineering, fluid mechanics, material engineering and related technologies.
Education	B.S., Keio University, Mechanical Engineering M.S., Keio University, School of Integrated Design Engineering
Career	Japanese Patent Attorney since 2010.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Hajime Tatsukawa
Specialties	Patent practice before the Japan Patent Office; standard essentiality evaluation; start-up supports and consulting; Particular experience in the fields of telecommunications, image processing, security and computing.
Education	B.S., University of Tokyo, Mechano-informatics M.S., University of Tokyo, Mechano-informatics
Career	Active in the patent field since 2007. Japanese patent attorney since 2010. Worked for NTT Communications as system engineer for development of government systems Worked for Accenture Japan Ltd. as analyst and consultant for mission-critical system integration.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Junya Ohde (Partner)
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the fields of software, Artificial Intelligence (AI) and networks.
Education	B.S., University of Tsukuba, System Engineering M.S., University of Tsukuba, System Engineering
Career	Japanese Patent Attorney since 2011. Worked for Ericsson Japan as a software engineer, in design and development of base station for a W-CDMA system. Worked for Sony Corp. as a software engineer, in design and development of TV/DVD, later moving to Sony IP center as an in-house patent attorney and engaging in patent licensing and negotiations.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Tomofumi Kinoshita (Partner)
Specialties	Patent practice in chemical enginnering and pharmaceutical fields, particular expertise in organic chemistry, especially in development of the new catalytic asymmetric reactions applicable to the efficient production of anticancer drugs and anti-Influenza drugs; and especially computer-related technology expertise.
Education	B.S., University of Tokyo, Pharmaceutical Sciences M.S., University of Tokyo, Pharmaceutical Sciences
Career	Japanese Patent Attorney since 2013.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Tomotake Ogawa
Specialties	Patent and design practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in the fields of semiconductors and electronic circuits.
Education	B.S., University of Tohoku, Electronic Engineering M.S., University of Tohoku, Electronic Engineering
Career	Japanese Patent Attorney since 2013. Worked for Renesas Electronics Corporation as a semiconductor engineer, for design and development of semiconductor production platforms.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Mioko Watanabe
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in digital mobile communication systems and related technologies.
Education	B.S., Keio University, Electrical Engineering M.S., Keio University, Electrical Engineering
Career	Japanese Patent Attorney since 2013. Worked for Ericsson Japan as a researcher and a developer for the 3rd generation mobile communication systems. Worked for the Japan Patent Office as Patent Examiner in the field of Digital Mobile Communication Systems.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Terukazu Ayuzawa (Partner)
Specialties	Patent practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; Particular experience in the fields of inorganic chemistry, organic chemistry, pharmaceuticals and metal material.
Education	B.S., Osaka Prefecture University, Applied Chemistry M.S., Osaka Prefecture University, Applied Chemistry
Career	Japanese Patent Attorney since 2014. Worked for Furukawa as a researcher in the field of inorganic materials. Worked for the Japan Patent Office as Patent Examiner in the field of Chemistry division for 9 years.
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Yasumasa Kusunoki (Partner)
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; particular experice in the fields of communications, networks, computer hardware and software.
Education	B.S., Yamaguchi University, Intelligence Information System Engineering M.S., Yamaguchi University, Intelligence Information System Engineering
Career	Japanese Patent Attorney since 2016. Worked for Panasonic MSE Corporation, engaged in the Linux platform, software development for mobile terminals.
Membership(s)	Japan Patent Attorneys Association (JPAA) The Institute of Electronics, Information and Communication Engineers
Publication(s)	Digital Watermarking based on Spread Spectrum (IEICE, October 2000)

Patent Attorney	Wakako Ohtsuka
Specialties	Patent, design and trademark practice before the Japan Patent Office and Intellectual Property High Court; Biochemistry and biotechnology, consumer products.
Education	B.S., Meiji University, Department of Agriculture M.S., Chiba University, Bioresources Science (Study about apoptosis of plant cell protoplast in culture)
Career	Worked for Cocoroca Corp. in the Medical Device Division, on medical device development
Membership(s)	Japan Patent Attorneys Association (JPAA)

Patent Attorney	Ryo Okawa
Specialties	Patent and design practice before the Japan Patent Office and Intellectual Property High Court; litigation and preliminary injunction proceedings before courts; legal opinions on infringement and validity; particular experience in the fields of machinery, mechanisms, and control systems.
Education	B.S., Kyoto University, Engineering Science
Career	Japanese Patent Attorney since 2020 Worked for Hitachi Construction Machinery Co., Ltd. as an engineer for developing hydraulic systems of excavators.
Membership(s)	Japan Patent Attorneys Association (JPAA)