Patent 無線通信システム 平賀健, 関智弘, 坂元一光, 中川匡夫, 上原一浩 Application no. 特願2012-287926 Date applied Dec 28, 2012 Announcement no. 特開2014-131182 Date announced Jul 10, 2014 Patent/Registration no. 特許5952731 Date registered Jun 17, 2016 Date issued