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Shigeru Osuga

Of counsel / Attorney at Law

Tokyo Office

Major Practice Areas
Intellectual Property / Information Technology / Dispute Resolution


Shigeru Osuga has served as Of Counsel of Kitahama Partners since he joined the Tokyo Office in November 2018. Before joining the firm, Mr. Osuga had served as a judge, including in the Intellectual Property High Court, the Intellectual Property Rights Department of the Tokyo District Court (department chief), and other courts, where he mainly presided over IP-related litigation until July 2018. He has been in charge of some prominent cases, such as the recent Apple v. Samsung “bounce-back” patent litigation. He also worked for many years in the Ministry of Justice’s Litigation Department, and has experience with litigation strategies. After joining Kitahama Partners, he has also worked with patent administration in areas such as training appeal examiners for the Patent Office in accordance with patent law reform hearings from the Patent Office and Institute of Intellectual Property. He would like to use this experience to assist his clients, particularly in the area of patent litigation.

Work Highlights

  • Written opinion of an appeal for invalidation of the registration of extension of duration of a drug patent
  • Examination for an investigation committee that was commissioned by a government agency

Education & Professional Career

Nov 2018 – PresentKitahama Partners, Of Counsel
Nov 2018Admitted to practice in Japan
Jul 2018 Retired from the position of Judge (based on the mandated age limit)
Sep 2017Yokohama Family Court, Chief Judge
Dec 2015Gifu District/Family Court, Chief Judge
Aug 2014Kagoshima District/Family Court, Chief Judge
Apr 2014Intellectual Property High Court, Judge
Apr 2010Tokyo District Court, Judge (Intellectual Property Rights Department, Chief Judge)
Apr 2009Intellectual Property High Court, Judge
Apr 2008Ministry of Justice, Minister’s Secretariat, Counsellor
Apr 2007Ministry of Justice, Minister’s Secretariat, Director of the Litigation Planning and Coordination Division
Apr 2005Ministry of Justice, Minister’s Secretariat, Director of the Civil Litigation Division
Apr 2004Ministry of Justice, Minister’s Secretariat, Director of the Administrative Litigation Division
Apr 2003Ministry of Justice, Minister’s Secretariat, Director of the Property Litigation Division
Apr 1999Tokyo Legal Affairs Bureau, Deputy Chief of the Litigation Department
Apr 1996Fukuoka Legal Affairs Bureau, Public Prosecutor assigned to the Litigation Department
Apr 1994Tokyo District Court, Judge (Intellectual Property Rights Department)
Apr 1992Tokyo District Court, Assistant Judge (April 1993- Intellectual Property Rights Department)
Apr 1984Osaka District Court, Assistant Judge
Apr 1984Graduated from the Legal Training and Research Institute of the Supreme Court of Japan
Mar 1979The University of Tokyo (LL.B.)

Other Activities

2019 – PresentLecturer, Training Course of Litigation and Practice, Japan Patent Office
Oct 2019 – PresentCivil Conciliation Commissioner, Tokyo District Court (in charge of Intellectual Property Conciliation)
Jun 2019 – PresentMember, Design and Law Association
2013 – 2014Provisional Member, Industrial Property Council (in charge of patent attorney examination)
May 2012 – PresentCommissioner, The Copyright Law Association of Japan
Jul 2011 – PresentSpecial Member, Design Study Group of the Japan Design Protection Association
May 2011 – Mar 2014Expert Committee Member, Copyright Division of the Council for Cultural Affairs
2003 – 2006Member, Inspection Committee of the Second Stage Examination of the Bar Exam (Civil Law, Civil Procedure Law)