Patent 無線通信空間 岸野康博, 上原一浩, 鹿子嶋憲一 Application no. 特願平09-043135 Date applied Feb 27, 1997 Announcement no. 特開平10-242683 Date announced Sep 11, 1998 Patent/Registration no. 特許3604526 Date registered Sep 28, 2004 Date issued