Inventor
KAWATOBI TATSUO
JP4 patents
Patents
4 patentsUS5398329AMar 14, 1995
System for switching between first and second control unit and broadcasting switchover to connecting hosts indicating availability of first and second communication links
HITACHI LTD25 citations91
US5051992ASep 24, 1991
Data link control method and system for integrated services digital network
HITACHI LTD41 citations89
US4879742ANov 7, 1989
Charging system in data communication network
HITACHI LTD41 citations89
US4875208AOct 17, 1989
Transmission method for control information in communication network
HITACHI LTD46 citations87