Inventor · disambiguated record
Keizo Kumagai
Also filed as: KUMAGAI KEIZO
10 granted patents·2 pending applications·100 citations·filing 2005–2021
88Inventor score
Top patents by PatentIndex Score
12 records- 0186US7378823B2Multi-output type DC/DC converter with a constant on time interval in a steady stateMITSUMI ELECTRIC CO LTD·Filed 2005·Granted May 27, 2008·30 cites·14 claims
- 0286US7372239B2Multi-output type DC/DC converterMITSUMI ELECTRIC CO LTD·Filed 2007·Granted May 13, 2008·25 cites·7 claims
- 0385US11387821B2Pulse signal sending circuitKUMAGAI KEIZO·Filed 2021·Granted Jul 12, 2022·2 cites·13 claims
- 0473US8310219B2DC-DC converter with a PWM mode and a continuously on modeKUROYABU MASAKI·Filed 2009·Granted Nov 13, 2012·16 cites·5 claims
- 0571US9048729B2Step-up/down DC-DC converter and switching control circuitKUMAGAI KEIZO·Filed 2011·Granted Jun 2, 2015·4 cites·5 claims
- 0669US7977890B2Direct current power supply device, power supply device for driving LED and semiconductor integrated circuit for controlling power supplyMITSUMI ELECTRIC CO LTD·Filed 2009·Granted Jul 12, 2011·9 cites·7 claims
- 0767US7977889B2Direct-current power supply device, power supply device for driving LED and semiconductor integrated circuit for driving power supplyMITSUMI ELECTRIC CO LTD·Filed 2009·Granted Jul 12, 2011·3 cites·6 claims
- 0861US8193793B2DC-DC converterKUMAGAI KEIZO·Filed 2009·Granted Jun 5, 2012·6 cites·4 claims
- 0958US7733070B2Multi-output type DC/DC converterMITSUMI ELECTRIC CO LTD·Filed 2007·Granted Jun 8, 2010·5 cites·10 claims
- 1039US2006220622A1Multi-output type DC/DC converter operable at a current discontinuous mode or a current continuous modeMITSUMI ELECTRIC CO LTD·Filed 2005·Application pending·0 cites
- 1138US8957650B2Step-up/down DC-DC converter and switching control circuitKUMAGAI KEIZO·Filed 2011·Granted Feb 17, 2015·0 cites·6 claims
- 1236US2012105031A1Switching power-supply unitKUMAGAI KEIZO·Filed 2011·Application pending·0 cites
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