Case C-415/99: Reference for a preliminary ruling by the High Court of Justice (England & Wales), Chancery Division (Patent Court), by order of that court of 22 July 1999, in the case of 1) Levi Strauss & Co. (a US corporation existing under the laws of the State of Delaware) and 2) Levi Strauss (UK) Ltd against 1) Tesco Stores Ltd and 2) Tesco plc