Kei Ikegami

Attorney at Law

Mr. Ikegami primarily deals with general corporate legal affairs and litigation, focusing on domestic and international legal affairs and dispute settlement (litigation, judicial proceedings, etc.) in relation to intellectual property rights, such as patents, copyrights and trademarks.

Major matters handled

• Claim for declaration of right of lease in relation to a fixed-term lease agreement
Mr. Ikegami represented a company that operated a pharmacy in a leased shop in a medical mall. After the expiration of the lease agreement, the lessor, the company operating the medical mall, demanded that the lessee vacate the premises following notice of the termination of the agreement, on the basis that the fixed-term lease agreement had expired. However, the lessee refused to leave and continued business, and filed litigation seeking a declaration that it had a right of lease without a fixed term.

• Patent litigation for a slot machine patent
Mr. Ikegami represented Aruze Corporation in the appeal of a trial against SNK Playmore Corporation seeking an injunction against sale and damages on the grounds of infringement of Aruze’s patents for slot-machine pachinko machines, and also in litigation against the decision to revoke Aruze’s slot-machine patents.

• Product liability litigation relating to a factory fire
Mr. Ikegami represented a production equipment manufacturer in litigation for damages. When a fire occurred in the manufacturer’s customer’s factory, the customer and its insurer, which had made a fire insurance payout to the customer, sued the manufacturer on the grounds that the fire was caused by abnormal generation of heat due to a defect in the manufacturer’s products.

• Damages claim for defective pharmaceuticals
Mr. Ikegami represented a Japanese pharmaceuticals maker. The Japanese company outsourced the production of pharmaceuticals for sale in Japan to a Taiwanese pharmaceuticals maker, but defective products with serious faults were discovered among the products manufactured by the Taiwanese company shortly after the commencement of production. Shipping of the Taiwanese company’s products was temporarily suspended and the Japanese company terminated the outsourcing agreement and filed litigation seeking damages from the Taiwanese maker.
The points in dispute in the litigation included the validity of the termination and the appropriateness of the suspension of shipping, but as the court allowed a settlement proposal that mostly followed the Japanese company’s proposal, a settlement in the Tokyo District Court was achieved.

• Invalidity trials for LED patents
Mr. Ikegami represented the Taiwanese company Everlight Electronics Co., Ltd. in invalidation trials for Japanese LED patents held by Nichia Corporation (including JP 3503139 and three other patents).

Professional Career

  • Tsuyama Law Offices, 2006–2009
  • Attorney at Law, Kuroda Law Offices, 2009–present


  • University of Tokyo Faculty of Law, 1999
  • Legal Training and Research Institute of the Supreme Court, 2007


  • Passed the National Bar Examination of Japan, 2004
  • Registered with the Japan Federation of Bar Associations and the Daiichi Tokyo Bar Association, 59th term, 2007


  • A Guide to Investing in the Philippines (co-author with Kuroda Law Offices). Canaria Communications, 2016.


  • Japanese and English