Inventor
HAMATANI FUMIKAZU
JP8 patents
⚠️ This page may combine multiple inventors who share the name “HAMATANI FUMIKAZU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NITSUKO LTD
6 patentsUS5182768AJan 26, 1993
Digital telephone set capable of being simultaneously used by a plurality of persons by using one transmission line
NITSUKO LTD15 citations73
US4536619AAug 20, 1985
Ringing signal detection circuit
NITSUKO LTD10 citations65
US4185173AJan 22, 1980
Key telephone call signalling circuit
NITSUKO LTD5 citations60
US4087649AMay 2, 1978
Pulse counting circuit
NITSUKO LTD2 citations60
US4081625AMar 28, 1978
Control circuitry for key telephone apparatus
NITSUKO LTD5 citations56
US4087644AMay 2, 1978
Dial impulse relay circuit
NITSUKO LTD1 citations50
TIE COMMUNICATIONS
2 patentsUS4740955AApr 26, 1988
Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones
TIE COMMUNICATIONS101 citations91
US4341927AJul 27, 1982
Data transmission apparatus
TIE COMMUNICATIONS14 citations71