Inventor · disambiguated record
Takayuki Maruta
Also filed as: MARUTA TAKAYUKI
25 granted patents·1 pending application·963 citations·filing 1988–2005
97Inventor score
Top patents by PatentIndex Score
26 records- 0197US5860038AApparatus and method for detecting developing ability of an image forming apparatusRICOH KK·Filed 1997·Granted Jan 12, 1999·91 cites·18 claims
- 0294US6055386AApparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modesRICOH KK·Filed 1998·Granted Apr 25, 2000·60 cites·6 claims
- 0394US5384628ADeveloping device for image forming equipmentRICOH KK·Filed 1993·Granted Jan 24, 1995·67 cites·33 claims
- 0494US5270783AImage forming equipment having improved toner sensingRICOH KK·Filed 1992·Granted Dec 14, 1993·66 cites·9 claims
- 0593US6823149B2Image forming apparatus with variable speed transferring and fixing devicesRICOH KK·Filed 2003·Granted Nov 23, 2004·43 cites·5 claims
- 0693US5227842AElectrophotographic image forming apparatus which controls developer bias based on image irregularityRICOH KK·Filed 1992·Granted Jul 13, 1993·62 cites·18 claims
- 0792US6226481B1Image forming apparatus with control over developing unit during an idle running of an intermediate image transfer bodyRICOH KK·Filed 1999·Granted May 1, 2001·57 cites·7 claims
- 0892US5671470AColor image forming device which changes developing bias when switching between developer unitsRICOH KK·Filed 1995·Granted Sep 23, 1997·53 cites·11 claims
- 0991US5826146AColor image forming device which changes developing bias when switching between developer unitsRICOH KK·Filed 1997·Granted Oct 20, 1998·49 cites·30 claims
- 1091US4916547AColor image forming apparatusRICOH KK·Filed 1988·Granted Apr 10, 1990·90 cites·8 claims
- 1186US7474867B2Magnetic carrier, two-component developer, development method, development device and image forming apparatus of electrophotographyRICOH KK·Filed 2005·Granted Jan 6, 2009·8 cites·2 claims
- 1286US7174124B2Tandem color image forming apparatus with an image transfer belt and backup rollerRICOH KK·Filed 2003·Granted Feb 6, 2007·25 cites·36 claims
- 1386US7139512B2Charging device, process cartridge and image forming apparatusRICOH KK·Filed 2005·Granted Nov 21, 2006·8 cites·11 claims
- 1485US5298944ATesting image density to control toner concentration and dynamic range in a digital copierRICOH KK·Filed 1993·Granted Mar 29, 1994·32 cites·15 claims
- 1580USRE41934EImage forming systemRICOH CO LTD·Filed 2005·Granted Nov 16, 2010·5 cites·12 claims
- 1679US5835825AColor image forming device having a revolver developing unitRICOH KK·Filed 1996·Granted Nov 10, 1998·28 cites·8 claims
- 1779US5424809AImage forming method and apparatus for the sameRICOH COMAPANY LTD·Filed 1993·Granted Jun 13, 1995·31 cites·11 claims
- 1878US6535707B2Image forming systemRICOH KK·Filed 2001·Granted Mar 18, 2003·15 cites·6 claims
- 1978US5293198AImage forming apparatus for controlling the dynamic range of an imageRICOH KK·Filed 1991·Granted Mar 8, 1994·24 cites·9 claims
- 2077US5724634AImage forming device in which developer roller speed is controlled in developer transfer to a photoconductive drumRICOH KK·Filed 1996·Granted Mar 3, 1998·26 cites·12 claims
- 2176US6160569AImage forming apparatus capable of changing process line speedRICOH KK·Filed 1999·Granted Dec 12, 2000·72 cites·18 claims
- 2276US5237369AColor image forming equipment responsive to changes in ambient conditionsRICOH KK·Filed 1991·Granted Aug 17, 1993·22 cites·11 claims
- 2372US7139517B2Developing method for an image forming apparatus and developing device using the sameRICOH KK·Filed 2005·Granted Nov 21, 2006·3 cites·46 claims
- 2463US5881334AImage forming apparatus and method for preventing wasted tonerRICOH KK·Filed 1997·Granted Mar 9, 1999·20 cites·19 claims
- 2558US7161712B2Apparatus for forming images with proper gamma correctionRICOH KK·Filed 2002·Granted Jan 9, 2007·6 cites·10 claims
- 2635US2003175046A1Charging device, process cartridge and image forming apparatusFiled 2003·Application pending·0 cites
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