Inventor · disambiguated record
Yoshihiro Sakai
Also filed as: SAKAI YOSHIHIRO · SHIGUMA HEIJIRO
66 granted patents·3 pending applications·1,431 citations·filing 1979–2025
99Inventor score
Top patents by PatentIndex Score
69 records- 0197US4933727AColor recording apparatusRICOH KK·Filed 1989·Granted Jun 12, 1990·72 cites·9 claims
- 0295US5937232AImage forming apparatus with display device for displaying before and after image processing dataRICOH KK·Filed 1995·Granted Aug 10, 1999·76 cites·24 claims
- 0395US5121170ADevice for transporting sheet members using an alternating voltageRICOH KK·Filed 1991·Granted Jun 9, 1992·72 cites·25 claims
- 0493US4922301ARotary multicolor developing apparatusRICOH KK·Filed 1989·Granted May 1, 1990·52 cites·17 claims
- 0592US7424255B2Device and method for belt speed control, and image forming apparatusRICOH KK·Filed 2005·Granted Sep 9, 2008·13 cites·10 claims
- 0692US6947693B2Image forming apparatus including rotary member speed detection mechanismRICOH KK·Filed 2003·Granted Sep 20, 2005·40 cites·27 claims
- 0792US5160969AImage forming apparatus having a separate black developer stored for a color imageRICOH KK·Filed 1991·Granted Nov 3, 1992·52 cites·11 claims
- 0891US7303808B2Bulky sheet material having three-dimensional protrusionsKAO CORP·Filed 2001·Granted Dec 4, 2007·45 cites·15 claims
- 0991US5545381ADevice for regenerating printed sheet-like recording mediumRICOH KK·Filed 1992·Granted Aug 13, 1996·68 cites·17 claims
- 1089US4796050AMechanism for driving photosensitive drumsRICOH KK·Filed 1987·Granted Jan 3, 1989·43 cites·1 claims
- 1187US5612766ADevice for regenerating printed sheet-like recording mediumRICOH KK·Filed 1995·Granted Mar 18, 1997·48 cites·14 claims
- 1286US7637045B2Surface light source and electrically illuminated signboardASAGICREATE CO LTD·Filed 2005·Granted Dec 29, 2009·12 cites·12 claims
- 1386US7606514B2Belt driving apparatus, image forming apparatus, belt driving method, and computer-readable medium for driving a beltRICOH KK·Filed 2006·Granted Oct 20, 2009·8 cites·17 claims
- 1485US7532370B2Optical encoder, motor driver and image forming apparatusRICOH KK·Filed 2003·Granted May 12, 2009·27 cites·35 claims
- 1585US4664501AMethod of and apparatus for producing duplicates in colorRICOH KK·Filed 1985·Granted May 12, 1987·29 cites·6 claims
- 1684US4690542AColor copying apparatusRICOH KK·Filed 1985·Granted Sep 1, 1987·28 cites·7 claims
- 1783US7517105B2Surface light source and electrically illuminated signboardASAGICREATE CO LTD·Filed 2007·Granted Apr 14, 2009·8 cites·8 claims
- 1883US4662739AMethod of controlling copying machine operationRICOH KK·Filed 1985·Granted May 5, 1987·26 cites·2 claims
- 1982US5911899ACorrosion-proof transparent heater panels and preparation process thereofMITSUI CHEMICALS INC·Filed 1996·Granted Jun 15, 1999·66 cites·28 claims
- 2081US4951269AEcho canceller with short processing delay and decreased multiplication numberFUJITSU LTD·Filed 1987·Granted Aug 21, 1990·34 cites·12 claims
- 2180US4265287APneumatic tire having anti-transverse skid property for vehicles which run at high speed under heavy loadBRIDGESTONE TIRE CO LTD·Filed 1979·Granted May 5, 1981·25 cites·12 claims
- 2279US9033649B2Corrosive environment monitoring system and corrosive environment monitoring methodKATO HIDEO·Filed 2010·Granted May 19, 2015·3 cites·16 claims
- 2379US7133630B2Belt device, image forming apparatus, and method to control belt speedRICOH KK·Filed 2004·Granted Nov 7, 2006·16 cites·9 claims
- 2479US7076195B2Endless belt unit, image forming apparatus, and method of driving and controlling belt memberRICOH KK·Filed 2003·Granted Jul 11, 2006·16 cites·15 claims
- 2579US4289183ANoiseless lug tiresBRIDGESTONE TIRE CO LTD·Filed 1979·Granted Sep 15, 1981·25 cites·5 claims
- 2676US5926670AImage forming apparatus cleaning an intermediate transfer member carrying a concurrently existing plurality of toner image pagesRICOH KK·Filed 1998·Granted Jul 20, 1999·30 cites·8 claims
- 2775US5321475AColor image forming apparatus which accelerates or decelerates the developing sleeves at a constant rateRICOH KK·Filed 1993·Granted Jun 14, 1994·21 cites·16 claims
- 2873US4655579AMulticolored image forming apparatusRICOH KK·Filed 1985·Granted Apr 7, 1987·28 cites·24 claims
- 2972US4717965APortable image forming deviceRICOH KK·Filed 1986·Granted Jan 5, 1988·27 cites·20 claims
- 3071US7102797B2Image reading device and image forming apparatus including the image reading deviceRICOH KK·Filed 2002·Granted Sep 5, 2006·10 cites·18 claims
- 3171USRE37197EDevice for regenerating printed sheet-like recording mediumRICOH KK·Filed 1998·Granted May 29, 2001·21 cites·45 claims
- 3271US6057869AImage forming apparatus for fixing a toner image at a first speed or at a second speedRICOH KK·Filed 1997·Granted May 2, 2000·22 cites·10 claims
- 3371US4266418AMethod for manufacturing a taper springNHK SPRING CO LTD·Filed 1979·Granted May 12, 1981·11 cites·4 claims
- 3469US8485582B2Storage device for vehicleHONDA MOTOR CO LTD·Filed 2012·Granted Jul 16, 2013·4 cites·7 claims
- 3568US4742371AOptical system for color copierRICOH KK·Filed 1987·Granted May 3, 1988·16 cites·21 claims
- 3666US7576509B2Drive control method, drive control device, belt apparatus, image forming apparatus, image reading apparatus, computer productRICOH KK·Filed 2004·Granted Aug 18, 2009·11 cites·94 claims
- 3765US5426549AMagnetic head positioning mechanism having electrical wiring plated thereuponNEC CORP·Filed 1993·Granted Jun 20, 1995·14 cites·8 claims
- 3864US5323486ASpeech coding system having codebook storing differential vectors between each two adjoining code vectorsFUJITSU LTD·Filed 1991·Granted Jun 21, 1994·44 cites·32 claims
- 3964US4690541AColor electrophotographic copying processRICOH KK·Filed 1985·Granted Sep 1, 1987·21 cites·16 claims
- 4063US7696713B2Drive control method, drive control device, belt apparatus, image forming apparatus, image reading apparatus, computer productRICOH KK·Filed 2007·Granted Apr 13, 2010·4 cites·13 claims
- 4163US4215558AProcess of manufacturing a taper leaf spring and its deviceNHK SPRING CO LTD·Filed 1979·Granted Aug 5, 1980·19 cites·4 claims
- 4262US4746950AColor copierRICOH KK·Filed 1986·Granted May 24, 1988·13 cites·11 claims
- 4362US2024420122A1Method for making a real trustless cryptocurrency utilizing adaptive differential privacy based witness encryptionSAKAI YOSHIHIRO·Filed 2023·Application pending·0 cites
- 4461US7170258B2Electrical device for charging batteriesSONY CORP·Filed 2004·Granted Jan 30, 2007·8 cites·3 claims
- 4561US4750017AComposite copying method and color copier for practicing the sameRICOH KK·Filed 1986·Granted Jun 7, 1988·12 cites·7 claims
- 4661US2025391622A1RelayFCL COMPONENTS LTD·Filed 2025·Application pending·0 cites
- 4756US5631691AImage forming apparatusRICOH KK·Filed 1993·Granted May 20, 1997·14 cites·7 claims
- 4853US5819143AColor image forming apparatus and methodRICOH KK·Filed 1996·Granted Oct 6, 1998·17 cites·11 claims
- 4953US2025074520A1Travel driving apparatusKOMATSU MFG CO LTD·Filed 2023·Application pending·0 cites
- 5049US10260187B2Foot controller of sewing machineJANOME SEWING MACHINE CO LTD·Filed 2017·Granted Apr 16, 2019·0 cites·7 claims
Showing the top 50 of 69 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →