Inventor
TAKEMURA TETSUO
JP8 patents
Patents
8 patentsUS5208811AMay 4, 1993
Interconnection system and method for heterogeneous networks
HITACHI LTD306 citations98
US4403322ASep 6, 1983
Voice signal converting device
HITACHI LTD78 citations96
US5157390AOct 20, 1992
Method for providing network service in a communication system
HITACHI LTD77 citations91
US5838770ANov 17, 1998
Portable telephone system
HITACHI LTD19 citations90
US5579370ANov 26, 1996
Portable telephone system
HITACHI LTD27 citations90
US5675632AOct 7, 1997
Telephone exchange network using telephone exchanges with speech recognition
HITACHI LTD18 citations83
US4680752AJul 14, 1987
Time switch in a time division switching network
HITACHI LTD14 citations73
US4477899AOct 16, 1984
Digital data transmission system with time division/packet transformation function
HITACHI LTD7 citations73