Inventor
TAKATO KENJI
JP18 patents
Patents
18 patentsUS4995111AFeb 19, 1991
Ring trip circuit for subscriber telephone
FUJITSU LTD81 citations95
US5311518AMay 10, 1994
ISDN interface circuit and system using the same
FUJITSU LTD68 citations94
US5402482AMar 28, 1995
Ring trip deciding circuit
FUJITSU LTD23 citations91
US5347577ASep 13, 1994
Battery feed circuit for supplying feed current to telephone set
FUJITSU LTD26 citations91
US4827505AMay 2, 1989
Subscriber line interface circuit
FUJITSU LTD26 citations91
US5402485AMar 28, 1995
Two-wire termination impedance generation circuit of subscriber circuit
FUJITSU LTD24 citations89
US6310953B1Oct 30, 2001
Subscriber circuit
FUJITSU LTD16 citations84
US4827503AMay 2, 1989
Integrated ringing circuit and a ring trip circuit for the same
FUJITSU LTD21 citations81
US5113426AMay 12, 1992
Ground fault detector
FUJITSU LTD8 citations73
US4935960AJun 19, 1990
Battery feed circuit
FUJITSU LTD16 citations73
US4862309AAug 29, 1989
Protection circuit for battery feed circuit
FUJITSU LTD10 citations73
US4982422AJan 1, 1991
Terminating circuit in a battery feed circuit of an electronic exchange system
FUJITSU LTD11 citations72
US5335271AAug 2, 1994
Ring trip detection circuit
FUJITSU LTD14 citations69
US4912429AMar 27, 1990
Operational amplifier
FUJITSU LTD5 citations62
US4748659AMay 31, 1988
Calling signal transmission apparatus
FUJITSU LTD2 citations61
US4631366ADec 23, 1986
Battery feed circuit for subscriber line
FUJITSU LTD6 citations60
US6005933ADec 21, 1999
Method for communication with no power feed and exchange for realizing the method
FUJITSU LTD1 citations52
US5128992AJul 7, 1992
Hybrid circuit
FUJITSU LTD1 citations52