Inventor
OISHI KAZUAKI
JP44 patents
⚠️ This page may combine multiple inventors who share the name “OISHI KAZUAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
25 patentsUS5818303AOct 6, 1998
Fractional N-frequency synthesizer and spurious signal cancel circuit
FUJITSU LTD62 citations95
US9270265B2Feb 23, 2016
Power on reset circuit, power supply circuit, and power supply system
FUJITSU LTD10 citations84
US7633346B2Dec 15, 2009
Transconductance compensating bias circuit and amplifier
FUJITSU LTD10 citations84
US7629853B2Dec 8, 2009
Amplifying apparatus and bias stabilization circuit
FUJITSU LTD15 citations84
US6674277B1Jan 6, 2004
Frequency measurement circuit
FUJITSU LTD14 citations84
US6317476B1Nov 13, 2001
Suppressing channel-dependent spurious signals in fractional-N synthesizer
FUJITSU LTD17 citations83
US7679447B2Mar 16, 2010
Variable gain amplifier circuit and filter circuit
FUJITSU LTD6 citations74
US6917191B2Jul 12, 2005
Frequency measurement circuit
FUJITSU LTD8 citations74
US6307427B1Oct 23, 2001
Filter characteristic regulating apparatus and regulating method therefor
FUJITSU LTD8 citations74
US10348260B2Jul 9, 2019
Amplifier circuit and filter
FUJITSU LTD5 citations73
US9807689B2Oct 31, 2017
Communication device, method and communication system
FUJITSU LTD2 citations73
US9614440B2Apr 4, 2017
Power supply device and semiconductor integrated circuit device
FUJITSU LTD6 citations73
US8938204B2Jan 20, 2015
Signal generator circuit and radio transmission and reception device including the same
FUJITSU LTD5 citations73
US7667523B2Feb 23, 2010
Orthogonal signal output circuit
FUJITSU LTD2 citations63
US7629846B2Dec 8, 2009
Source follower circuit and semiconductor apparatus
FUJITSU LTD2 citations63
US7315199B2Jan 1, 2008
Q value correction of filter circuit
FUJITSU LTD4 citations63
US11770142B2Sep 26, 2023
Wireless communication apparatus
FUJITSU LTD0 citations52
US9007248B2Apr 14, 2015
MASH sigma-delta modulator and DA converter circuit
FUJITSU LTD1 citations52
US8872582B2Oct 28, 2014
Amplifier circuit
FUJITSU LTD0 citations52
US8045949B2Oct 25, 2011
Noise cancellation circuit and amplifier with noise cancellation circuit
FUJITSU LTD1 citations52
US7855601B2Dec 21, 2010
Semiconductor device
FUJITSU LTD0 citations52
US9225288B2Dec 29, 2015
Signal generation circuit
FUJITSU LTD0 citations51
US9450549B2Sep 20, 2016
Differential amplification circuit
FUJITSU LTD0 citations42
US9099977B2Aug 4, 2015
Amplifier circuit
FUJITSU LTD0 citations42
US10050587B2Aug 14, 2018
Power amplifier circuit and semiconductor integrated circuit
FUJITSU LTD0 citations37
HITACHI LTD
12 patentsUS4744002AMay 10, 1988
Compact-type gas-insulated switchgear apparatus
HITACHI LTD26 citations89
US4277746AJul 7, 1981
Gas-insulated electric apparatus and method of detecting partial discharge therein
HITACHI LTD44 citations89
US4215256AJul 29, 1980
Gas-insulated switchgear apparatus
HITACHI LTD20 citations81
US4403125ASep 6, 1983
Gas-insulated disconnecting switch
HITACHI LTD19 citations78
US4045634AAug 30, 1977
Gas insulated switch-gear apparatus
HITACHI LTD21 citations78
US4032820AJun 28, 1977
Horizontal double plane high voltage switching assembly
HITACHI LTD28 citations78
US4866569ASep 12, 1989
Gas-insulated switchgear apparatus
HITACHI LTD18 citations74
US4354220AOct 12, 1982
Gas insulated power switch-gear apparatus
HITACHI LTD13 citations74
US4291363ASep 22, 1981
Gas-insulated switchgear apparatus
HITACHI LTD9 citations74
US4237520ADec 2, 1980
Gas insulated switch-gear apparatus
HITACHI LTD16 citations73
US4458099AJul 3, 1984
Three-phase combined type gas insulated electrical apparatus
HITACHI LTD7 citations68
US4747015AMay 24, 1988
Gas insulated switching apparatus
HITACHI LTD5 citations57
OISHI KAZUAKI
4 patentsUS8797111B2Aug 5, 2014
Poly-phase filter, and a single-side band mixer including the same
OISHI KAZUAKI4 citations72
US8482344B2Jul 9, 2013
Frequency-variable filter
OISHI KAZUAKI3 citations61
US8604955B2Dec 10, 2013
Filter, and transmitter and receiver having the same
OISHI KAZUAKI4 citations60
US8111096B2Feb 7, 2012
Variable gain amplifier circuit and filter circuit
OISHI KAZUAKI1 citations51