Inventor · disambiguated record
Hirofumi Fujiwara
Also filed as: FUJIWARA HIROFUMI
17 granted patents·9 pending applications·182 citations·filing 1978–2017
93Inventor score
Files withNEC ELECTRONICS CORP8TOYOTA JIDOSHOKKI KK4RENESAS ELECTRONICS CORP3NAKANISHI HARUYUKI2TOYOTA MOTOR CO LTD2
Top patents by PatentIndex Score
26 records- 0191US8475722B2Hydrogen generation device and method of using sameNAKANISHI HARUYUKI·Filed 2010·Granted Jul 2, 2013·10 cites·9 claims
- 0287US7663427B2Booster circuitNEC ELECTRONICS CORP·Filed 2007·Granted Feb 16, 2010·24 cites·20 claims
- 0385US7505290B2Power supply apparatus including charge-pump type step-up circuit having different discharging time constantsNEC ELECTRONICS CORP·Filed 2006·Granted Mar 17, 2009·22 cites·14 claims
- 0482US7445135B2Container and pusiierSHARP CHEMICAL IND CO LTD·Filed 2002·Granted Nov 4, 2008·38 cites·15 claims
- 0581US9760101B2Switching regulator control circuitRENESAS ELECTRONICS CORP·Filed 2013·Granted Sep 12, 2017·5 cites·14 claims
- 0676US7741899B2Step-up power supply circuit and stepping-up methodNEC ELECTRONICS CORP·Filed 2008·Granted Jun 22, 2010·6 cites·10 claims
- 0770US8657920B2Apparatus for purifying hydrogen and method for using the sameNAKANISHI HARUYUKI·Filed 2010·Granted Feb 25, 2014·2 cites·7 claims
- 0868US7069252B2Electronic transaction server, client for seller, client for buyer and electronic transaction methodINFORMATION TECHNOLOGY PROMOTI·Filed 2003·Granted Jun 27, 2006·16 cites·21 claims
- 0960US7855532B2Power supply circuit with control switches to voltage multiplier having same frequency as clockNEC ELECTRONICS CORP·Filed 2007·Granted Dec 21, 2010·5 cites·19 claims
- 1060US7324358B2Power supply apparatus including charge-pump type step-up circuit operated at clock signal frequencyNEC ELECTRONICS CORP·Filed 2006·Granted Jan 29, 2008·5 cites·21 claims
- 1160US4166531APacking device for electric fan of assembled typeSANYO ELECTRIC CO·Filed 1978·Granted Sep 4, 1979·21 cites·13 claims
- 1259US7183837B2Charge pump circuit with latch-up preventionNEC ELECTRONICS CORP·Filed 2004·Granted Feb 27, 2007·13 cites·16 claims
- 1358US7886923B2Container stopper with synthetic resin skinSUNTORY HOLDINGS LTD·Filed 2003·Granted Feb 15, 2011·6 cites·14 claims
- 1455US2010026679A1Booster circuit, display panel driver, and display deviceNEC ELECTRONICS CORP·Filed 2009·Application pending·0 cites
- 1553US9793784B2Cooling structure for slip ring deviceTOYOTA MOTOR CO LTD·Filed 2013·Granted Oct 17, 2017·1 cites·13 claims
- 1651US5130555ATape crease inspecting method and apparatus having a stripe shaped pattern reflection plateMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1989·Granted Jul 14, 1992·8 cites·18 claims
- 1751US2017364107A1Switching regulator control circuitRENESAS ELECTRONICS CORP·Filed 2017·Application pending·0 cites
- 1845US2015340936A1Vehicle drive apparatusTOYOTA JIDOSHOKKI KK·Filed 2013·Application pending·0 cites
- 1945US2015180313A1Rotating electric machineTOYOTA JIDOSHOKKI KK·Filed 2013·Application pending·0 cites
- 2043US2011199360A1Differential amplifier architecture adapted to input level conversionRENESAS ELECTRONICS CORP·Filed 2011·Application pending·0 cites
- 2142US8493147B2Differential amplifier and source driverFUJIWARA HIROFUMI·Filed 2011·Granted Jul 23, 2013·0 cites·12 claims
- 2241US7608946B2Boosting circuit and integrated circuit having the sameNEC ELECTRONICS CORP·Filed 2008·Granted Oct 27, 2009·0 cites·11 claims
- 2340US2015292463A1Vehicle control deviceTOYOTA JIDOSHOKKI KK·Filed 2013·Application pending·0 cites
- 2438US2015311772A1Slip ring deviceTOYOTA MOTOR CO LTD·Filed 2013·Application pending·0 cites
- 2537US2015288120A1Slip ring structureTOYOTA JIDOSHOKKI KK·Filed 2013·Application pending·0 cites
- 2635US2019094132A1Optical measurement probe and optical measurement device provided with sameSHIMADZU CORP·Filed 2016·Application pending·0 cites
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →