Inventor
SUMI FUJIO
JP6 patents
⚠️ This page may combine multiple inventors who share the name “SUMI FUJIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI ELECTRONICS
5 patentsUS5633862AMay 27, 1997
DTMF signal transmission method in single frequency simultaneous transmitting and receiving system and single frequency simultaneous transmitting and receiving system transceiver capable of transmitting DTMF signal
HITACHI ELECTRONICS21 citations92
US5493698AFeb 20, 1996
Radio apparatus for simulataneously transmitting and receiving signals using a simple frequency
HITACHI ELECTRONICS38 citations91
US5524274AJun 4, 1996
Transceiver controlled by absence/presence of input signal
HITACHI ELECTRONICS11 citations73
US5355363AOct 11, 1994
Voice transmission method and apparatus in duplex radio system
HITACHI ELECTRONICS9 citations71
US5697049ADec 9, 1997
Radio relay method, radio relay system using the method and radio unit
HITACHI ELECTRONICS3 citations61