Inventor · disambiguated record
Yoshiaki Kumagai
Also filed as: KUMAGAI YOSHIAKI
48 granted patents·3 pending applications·1,987 citations·filing 1983–2013
99Inventor score
Top patents by PatentIndex Score
51 records- 0197USD627769SMobile phoneSONY ERICSSON MOBILE COMM JP·Filed 2009·Granted Nov 23, 2010·78 cites·1 claims
- 0297US5926230AElectrical program guide system and methodSONY CORP·Filed 1996·Granted Jul 20, 1999·423 cites·8 claims
- 0397US4755978ADisc playerSONY CORP·Filed 1987·Granted Jul 5, 1988·153 cites·5 claims
- 0496USD665346SBattery chargerKUMAGAI YOSHIAKI·Filed 2011·Granted Aug 14, 2012·87 cites·1 claims
- 0594US5903314AElectrical program guide system and methodSONY CORP·Filed 1996·Granted May 11, 1999·228 cites·10 claims
- 0691USD431270SToySONY CORP·Filed 1999·Granted Sep 26, 2000·29 cites·1 claims
- 0787US5845260ASystem and method for parent-controlled charging for on-line servicesSONY CORP·Filed 1996·Granted Dec 1, 1998·431 cites·10 claims
- 0885USD331059SHeadphoneSONY CORP·Filed 1990·Granted Nov 17, 1992·26 cites·1 claims
- 0983USD494167SPortable information terminalSONY CORP·Filed 2003·Granted Aug 10, 2004·27 cites·1 claims
- 1078USD656489SEarphoneKUMAGAI YOSHIAKI·Filed 2011·Granted Mar 27, 2012·24 cites·1 claims
- 1177USD413885SCombined wireless telephone and keyboardSONY CORP·Filed 1997·Granted Sep 14, 1999·24 cites·1 claims
- 1276USD385562SMedia unitSONY CORP·Filed 1995·Granted Oct 28, 1997·19 cites·1 claims
- 1375USD517023SCombined remote controller and laser pointerSONY CORP·Filed 2004·Granted Mar 14, 2006·19 cites·1 claims
- 1475USD494166SPortable information terminalSONY CORP·Filed 2003·Granted Aug 10, 2004·20 cites·1 claims
- 1572USD452889SToySONY CORP·Filed 2000·Granted Jan 8, 2002·13 cites·1 claims
- 1669USD388095SMedia unitSONY CORP·Filed 1995·Granted Dec 23, 1997·15 cites·1 claims
- 1767USD695738SHead mountable displayKUMAGAI YOSHIAKI·Filed 2012·Granted Dec 17, 2013·14 cites·1 claims
- 1866USD745517SHead mountable displaySONY CORP·Filed 2013·Granted Dec 15, 2015·13 cites·1 claims
- 1965US7597457B2Lighting apparatusSONY CORP·Filed 2007·Granted Oct 6, 2009·1 cites·8 claims
- 2064US5257415AAutomatic transmission level control deviceFUJITSU LTD·Filed 1992·Granted Oct 26, 1993·45 cites·14 claims
- 2162USD649955SPortable recorderKUMAGAI YOSHIAKI·Filed 2010·Granted Dec 6, 2011·10 cites·1 claims
- 2262US5937336ATransmission/reception apparatusFUJITSU LTD·Filed 1997·Granted Aug 10, 1999·28 cites·8 claims
- 2362US5768694AAutomatic gain control circuit with input and output signal detectors operating in equalized conditionsFUJITSU LTD·Filed 1995·Granted Jun 16, 1998·30 cites·4 claims
- 2461USD597520SCombined disc player, clock and radio receiverSONY CORP·Filed 2008·Granted Aug 4, 2009·10 cites·1 claims
- 2559USD695739SHead mountable displayKUMAGAI YOSHIAKI·Filed 2012·Granted Dec 17, 2013·10 cites·1 claims
- 2659US5548811AAutomatic frequency control circuit selectively using frequency-divided local oscillator signal or pilot signalFUJITSU LTD·Filed 1994·Granted Aug 20, 1996·22 cites·13 claims
- 2758USD435035SSpeaker boxSONY CORP·Filed 1999·Granted Dec 12, 2000·9 cites·1 claims
- 2858US5410729ASignal transmission device having an automatic transmission level control circuit used in a multi-carrier transmission terminal equipment and multi-carrier transmission terminal equipment employing the transmission deviceFUJITSU LTD·Filed 1993·Granted Apr 25, 1995·16 cites·18 claims
- 2958USD279472STelevision projectorSONY CORP·Filed 1983·Granted Jul 2, 1985·6 cites·1 claims
- 3057US6125138ABase station transmitter-receiverFUJITSU LTD·Filed 1998·Granted Sep 26, 2000·37 cites·10 claims
- 3156USD597533SRemote controllerSONY CORP·Filed 2008·Granted Aug 4, 2009·9 cites·1 claims
- 3256US7336289B2Projection type display apparatusSONY CORP·Filed 2003·Granted Feb 26, 2008·3 cites·16 claims
- 3356USD496036SPortable information terminalSONY CORP·Filed 2003·Granted Sep 14, 2004·9 cites·1 claims
- 3456USD368473SCommunication deviceSONY CORP·Filed 1995·Granted Apr 2, 1996·9 cites·1 claims
- 3552USD665768SPortable recorderKUMAGAI YOSHIAKI·Filed 2011·Granted Aug 21, 2012·6 cites·1 claims
- 3651US5754949ATransmitter-receiver apparatusFUJISTU LIMITED·Filed 1996·Granted May 19, 1998·21 cites·4 claims
- 3749US2010081391A1Wireless communication systemFUJITSU LTD·Filed 2009·Application pending·0 cites
- 3848USD609691SCombined disc player, clock and radio receiverSONY CORP·Filed 2009·Granted Feb 9, 2010·5 cites·1 claims
- 3945USD412166STelevision receiverSONY CORP·Filed 1997·Granted Jul 20, 1999·5 cites·1 claims
- 4045US2014361734A1Power supply method, charging control device, and power supply systemYAMAZAKI DAISUKE·Filed 2011·Application pending·0 cites
- 4144USD595687SCombined disc player, clock and radio receiverSONY CORP·Filed 2008·Granted Jul 7, 2009·5 cites·1 claims
- 4243US5235292ASignal generator having backup oscillator switching circuitFUJITSU LTD·Filed 1992·Granted Aug 10, 1993·14 cites·19 claims
- 4342US5963587AWideband transceiverFUJITSU LTD·Filed 1996·Granted Oct 5, 1999·11 cites·12 claims
- 4441US2011300468A1Fuel cell deviceTAKABAYASHI HIROSHI·Filed 2010·Application pending·0 cites
- 4540USD686269SProjectorKUMAGAI YOSHIAKI·Filed 2012·Granted Jul 16, 2013·3 cites·1 claims
- 4640US6728264B1Radio base station for a CDMA mobile communication systemFUJITSU LTD·Filed 1999·Granted Apr 27, 2004·13 cites·12 claims
- 4738USD595688SCombined disc player, clock and radio receiverSONY CORP·Filed 2008·Granted Jul 7, 2009·3 cites·1 claims
- 4835USD452542SToySONY CORP·Filed 2001·Granted Dec 25, 2001·1 cites·1 claims
- 4935USD452541SToySONY CORP·Filed 2001·Granted Dec 25, 2001·1 cites·1 claims
- 5033USD675599SEarphoneSONY CORP·Filed 2012·Granted Feb 5, 2013·1 cites·1 claims
Showing the top 50 of 51 patent records by PatentIndex Score.
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