Inventor · disambiguated record
Eiji Yokoyama
Also filed as: UCHIDA RIICHI · YOKOYAMA EIJI
34 granted patents·6 pending applications·537 citations·filing 1977–2021
97Inventor score
Top patents by PatentIndex Score
40 records- 0194US4838897AReformerHITACHI LTD·Filed 1987·Granted Jun 13, 1989·82 cites·7 claims
- 0292US4174196AScrew fluid machineHITACHI LTD·Filed 1977·Granted Nov 13, 1979·46 cites·14 claims
- 0390US4554223AFuel cell apparatusHITACHI LTD·Filed 1984·Granted Nov 19, 1985·59 cites·9 claims
- 0483US5384676AMagnetic head position controller in a magnetic recording and reproducing apparatusMITSUBISHI ELECTRIC CORP·Filed 1992·Granted Jan 24, 1995·34 cites·47 claims
- 0578US6724503B1Image sensor substrate and image sensor employing itROHM CO LTD·Filed 1998·Granted Apr 20, 2004·57 cites·15 claims
- 0678US5602688AMethod and apparatus for controlling surface pressure exerted on a movable magnetic head by a recording mediumMITSUBISHI ELECTRIC CORP·Filed 1995·Granted Feb 11, 1997·24 cites·26 claims
- 0778US5481417ATape tension control for a magnetic recording and reproducing apparatus that adjusts spacing error based on the reproduced signal envelopeMITSUBISHI ELECTRIC CORP·Filed 1994·Granted Jan 2, 1996·20 cites·31 claims
- 0875US7661823B2Prism structure and projectorSEIKO EPSON CORP·Filed 2006·Granted Feb 16, 2010·4 cites·14 claims
- 0974US5566378AMovable head position controlling device for magnetic recording and reproducing apparatusesMITSUBISHI ELECTRIC CORP·Filed 1994·Granted Oct 15, 1996·19 cites·21 claims
- 1074US5404252AMovable head position controlling device for magnetic recording and reproducing apparatusesMITSUBISHI ELECTRIC CORP·Filed 1993·Granted Apr 4, 1995·19 cites·38 claims
- 1173US6947359B2Optical disk device for data defect detection and useMITSUBISHI ELECTRIC CORP·Filed 2001·Granted Sep 20, 2005·8 cites·7 claims
- 1270US4693945APower generator containing fuel cellHITACHI LTD·Filed 1986·Granted Sep 15, 1987·32 cites·7 claims
- 1368US5986984AOptical information processing device having switchable optics for use with plural media typesMITSUBISHI ELECTRIC CORP·Filed 1996·Granted Nov 16, 1999·23 cites·27 claims
- 1468US5157563AMagnetic recording and reproducing apparatus using an electromagnetic actuator for automatic trackingMITSUBISHI ELECTRIC CORP·Filed 1989·Granted Oct 20, 1992·15 cites·7 claims
- 1565US10495281B2Projection optical instrument and headlight deviceMITSUBISHI ELECTRIC CORP·Filed 2016·Granted Dec 3, 2019·1 cites·10 claims
- 1665US8879143B2Optical element, screen, and display deviceOKAGAKI SATORU·Filed 2010·Granted Nov 4, 2014·2 cites·13 claims
- 1765US7116611B2Position control methodMITSUBISHI ELECTRIC CORP·Filed 2002·Granted Oct 3, 2006·5 cites·10 claims
- 1865US5395066ATape tension control for a magnetic recording and reproducing apparatusMITSUBISHI ELECTRIC CORP·Filed 1992·Granted Mar 7, 1995·12 cites·4 claims
- 1963US6654218B1Protection circuit module for rechargeable battery and method of making the sameROHM CO LTD·Filed 2000·Granted Nov 25, 2003·11 cites·5 claims
- 2056US2024116736A1Elevator control system and method for controlling elevatorMITSUBISHI ELECTRIC CORP·Filed 2021·Application pending·0 cites
- 2155US2024312203A1Image processing device and image processing methodMITSUBISHI ELECTRIC CORP·Filed 2021·Application pending·0 cites
- 2254US2024034594A1Elevator deviceMITSUBISHI ELECTRIC CORP·Filed 2020·Application pending·0 cites
- 2352US5725168AMagnetic recording and reproducing apparatus for controlling the tension of a magnetic tapeMITSUBISHI ELECTRIC CORP·Filed 1996·Granted Mar 10, 1998·9 cites·15 claims
- 2451US6448993B1Construction of thermal print head and method of forming protective coatingROHM CO LTD·Filed 1998·Granted Sep 10, 2002·12 cites·3 claims
- 2550US2006002266A1Optical disk device for data defect detection and useYOKOYAMA EIJI·Filed 2005·Application pending·0 cites
- 2650US2022135367A1Elevator control deviceMITSUBISHI ELECTRIC CORP·Filed 2019·Application pending·0 cites
- 2749US5343342AMagnetic recording and playback system with feedback control of a movable transducer headMITSUBISHI ELECTRIC CORP·Filed 1991·Granted Aug 30, 1994·9 cites·39 claims
- 2847US8149665B2Optical disc deviceYOKOYAMA EIJI·Filed 2007·Granted Apr 3, 2012·0 cites·20 claims
- 2946US11101760B2Electric motor control deviceMITSUBISHI ELECTRIC CORP·Filed 2017·Granted Aug 24, 2021·0 cites·9 claims
- 3046US6469724B1Thick-film thermal print head and its manufacturing methodROHM CO LTD·Filed 1999·Granted Oct 22, 2002·9 cites·7 claims
- 3144US6236422B1Thermal printhead and protective cover used for the sameROHM CO LTD·Filed 1999·Granted May 22, 2001·8 cites·16 claims
- 3243US8675145B2ProjectorWAKABAYASHI SHINICHI·Filed 2010·Granted Mar 18, 2014·0 cites·4 claims
- 3342US6489757B2Optical interface with low-voltage relay unit and high-voltage regulation unitROHM CO LTD·Filed 2001·Granted Dec 3, 2002·6 cites·7 claims
- 3442US2022185506A1Formation flight control device, observation satellite, ground station, formation flight system, sand observation system, formation flight control method, and programMITSUBISHI ELECTRIC CORP·Filed 2019·Application pending·0 cites
- 3540US6424367B1Thick-film thermal printheadROHM CO LTD·Filed 1999·Granted Jul 23, 2002·6 cites·10 claims
- 3639US11586231B2Reaction compensation device and fast steering mirror systemMITSUBISHI ELECTRIC CORP·Filed 2017·Granted Feb 21, 2023·0 cites·18 claims
- 3738US8827457B2ProjectorYOKOYAMA EIJI·Filed 2011·Granted Sep 9, 2014·0 cites·5 claims
- 3838US8390951B2Vibration damping device and disc device having vibration damping deviceYOKOYAMA EIJI·Filed 2010·Granted Mar 5, 2013·0 cites·16 claims
- 3936US6304280B1Thermal printhead and method of making the sameROHM CO LTD·Filed 1998·Granted Oct 16, 2001·4 cites·6 claims
- 4032US5947402AMagnetic recording and reproducing apparatus for controlling the tension of a magnetic tapeMITSUBISHI ELECTRIC CORP·Filed 1997·Granted Sep 7, 1999·1 cites·10 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →