Inventor · disambiguated record
Seiya Kitagawa
Also filed as: KITAGAWA SEIYA
23 granted patents·2 pending applications·777 citations·filing 1996–2025
97Inventor score
Top patents by PatentIndex Score
25 records- 0191US5831418AStep-up/down DC-to-DC converterFUJITSU LTD·Filed 1997·Granted Nov 3, 1998·111 cites·12 claims
- 0286US6204633B1Power supply apparatus with chargeable battery and charge/discharge methodFUJITSU LTD·Filed 1998·Granted Mar 20, 2001·87 cites·3 claims
- 0383US6452364B1Battery charge control circuit, battery charging device, and battery charge control methodFUJITSU LTD·Filed 2000·Granted Sep 17, 2002·53 cites·70 claims
- 0482US6420858B1DC-to-DC converter circuit having a power saving modeFUJITSU LTD·Filed 1999·Granted Jul 16, 2002·64 cites·23 claims
- 0581US6707271B2Power supply apparatus with chargeable battery and charge/discharge methodFUJITSU LTD·Filed 2002·Granted Mar 16, 2004·35 cites·12 claims
- 0679US6445164B2Power supply apparatus with chargeable battery and charge/discharge methodFUJITSU LTD·Filed 2001·Granted Sep 3, 2002·32 cites·4 claims
- 0778US6169392B1DC-DC converter circuitFUJITSU LTD·Filed 1999·Granted Jan 2, 2001·33 cites·13 claims
- 0878US6091234AControl circuit of a synchronous rectification type DC-DC converterFUJITSU LTD·Filed 1998·Granted Jul 18, 2000·53 cites·9 claims
- 0977US7899896B2Method of selecting type of electronic part and electronic parts maker serverSANYO ELECTRIC CO·Filed 2007·Granted Mar 1, 2011·4 cites·4 claims
- 1076US5898234APower supply unit with simplified circuitryFUJITSU LTD·Filed 1996·Granted Apr 27, 1999·74 cites·5 claims
- 1173US6664772B2DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 2001·Granted Dec 16, 2003·19 cites·33 claims
- 1273US6194875B1Controller for DC-DC converterFUJITSU LTD·Filed 1999·Granted Feb 27, 2001·62 cites·21 claims
- 1373US6147477ADC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 1997·Granted Nov 14, 2000·32 cites·41 claims
- 1473US2025253759A1Element evaluation deviceROHM CO LTD·Filed 2025·Application pending·0 cites
- 1572US7386811B2Method of selecting type of electronic part and electronic parts maker serverSANYO ELECTRIC CO·Filed 2001·Granted Jun 10, 2008·4 cites·4 claims
- 1671US10917080B2Gate drive circuitROHM CO LTD·Filed 2017·Granted Feb 9, 2021·2 cites·7 claims
- 1771US6624613B2Power supply apparatus with chargeable battery and charge/discharge methodFUJITSU LTD·Filed 2002·Granted Sep 23, 2003·19 cites·2 claims
- 1870US5966003ADC-DC converter control circuitFUJITSU LTD·Filed 1998·Granted Oct 12, 1999·41 cites·29 claims
- 1963US6414403B2Power unitFUJITSU LTD·Filed 1998·Granted Jul 2, 2002·41 cites·20 claims
- 2061US6911806B2DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 2003·Granted Jun 28, 2005·10 cites·13 claims
- 2155US10941855B2Control device for vehicle and control method for vehicleJATCO LTD·Filed 2018·Granted Mar 9, 2021·0 cites·10 claims
- 2250US11365805B2Control device for vehicle and control method for vehicleJATCO LTD·Filed 2018·Granted Jun 21, 2022·0 cites·7 claims
- 2350US7129682B2DC to DC converter producing output voltage exhibit rise and fall characteristics independent of load thereonFUJITSU LTD·Filed 2005·Granted Oct 31, 2006·1 cites·11 claims
- 2449US12388441B2Gate driving circuitROHM CO LTD·Filed 2023·Granted Aug 12, 2025·0 cites·15 claims
- 2536US2022278681A1Switch driving circuitROHM CO LTD·Filed 2020·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →