Shionogi fails in lengthy legal battle against MSD

7 September 2018

Japan’s highest court for intellectual property disputes has dismissed Shionogi’s (TYO: 4507) lawsuit against a decision by the board of the Japanese Patent Office, related to the firm’s Japanese patent for HIV integrase inhibitors.

The case relates to a filing from Shionogi against MSD, the ex-North American name for USA’s Merck & Co (NYSE: MRK), stating that MSD’s integrase inhibitor Isentress (raltegravir) infringes the patent.

The Patent Office invalidated that patent in August 2017, following a legal action from MSD, a decision which Shionogi filed to have revoked.

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