The proceedings concerned four patents owned by Apple Inc ("Apple"), European Patents Nos. 2 098 948 (the "948 Patent"); 2 964 022 (the "022 Patent"); 2 059 868 (the "868 Patent") and 1 168 859 (the "859 Patent"). HTC Europe Co. Ltd ("HTC Europe") commenced revocation proceedings for three of the patents. Apple sued HTC Corporation ("HTC Corp") for infringement of the patents which were the subject of the revocation proceedings. HTC Corp then counterclaimed for revocation of the fourth patent. (HTC Europe and HTC Corp are referred to as HTC below.)