Inventor
ITOH YOSHITAKA
JP68 patents
⚠️ This page may combine multiple inventors who share the name “ITOH YOSHITAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SEIKO EPSON CORP
43 patentsUS6147802ANov 14, 2000
Polarization luminaire and projection display
SEIKO EPSON CORP79 citations97
US7119957B2Oct 10, 2006
Polarization luminaire and projection display
SEIKO EPSON CORP38 citations96
US6529250B1Mar 4, 2003
Projector
SEIKO EPSON CORP53 citations96
US6513953B1Feb 4, 2003
Illumination system and projector
SEIKO EPSON CORP59 citations96
US6411438B1Jun 25, 2002
Polarization luminaire and projection display
SEIKO EPSON CORP26 citations96
US6344927B1Feb 5, 2002
Polarization luminaire and projection display
SEIKO EPSON CORP29 citations96
US5626409AMay 6, 1997
Projection-type display apparatus
SEIKO EPSON CORP70 citations96
US4680048AJul 14, 1987
Method of preparing doped silica glass
SEIKO EPSON CORP58 citations94
US6778228B2Aug 17, 2004
Projection-type display apparatus
SEIKO EPSON CORP40 citations93
US6667834B2Dec 23, 2003
Polarization luminaire and projection display
SEIKO EPSON CORP17 citations93
US6497485B1Dec 24, 2002
Image projection system having uniform brightness
SEIKO EPSON CORP21 citations93
US6471358B1Oct 29, 2002
Lighting device and projector
SEIKO EPSON CORP17 citations93
US6445500B1Sep 3, 2002
Polarization luminaire and projection display
SEIKO EPSON CORP27 citations93
US6394607B1May 28, 2002
Polarized light separation device, method of fabricating the same and projection display apparatus using the polarized light separation device
SEIKO EPSON CORP50 citations93
US6348997B1Feb 19, 2002
Polarizing illuminating device and projector
SEIKO EPSON CORP19 citations93
US6341867B1Jan 29, 2002
Polarized light illumination device and projector
SEIKO EPSON CORP33 citations93
US6208451B1Mar 27, 2001
Polarization conversion system, illumination system, and projector
SEIKO EPSON CORP36 citations93
US6154320ANov 28, 2000
Polarizing conversion device, polarizing illuminations device, and display apparatus and projector using the devices
SEIKO EPSON CORP35 citations93
US6132047AOct 17, 2000
Polarized light illumination device and projector
SEIKO EPSON CORP24 citations93
US6109752AAug 29, 2000
Lighting device and projector
SEIKO EPSON CORP29 citations93
US6108132AAug 22, 2000
Polarized light separating/combining optical element, polarized light illuminating apparatus and projection-type display device
SEIKO EPSON CORP24 citations93
US6101040AAug 8, 2000
Illumination optical system and projection-type display apparatus
SEIKO EPSON CORP18 citations93
US6042234AMar 28, 2000
Polarized light illumination device and projection display device
SEIKO EPSON CORP45 citations93
US6036318AMar 14, 2000
Projection display
SEIKO EPSON CORP24 citations93
US5986809ANov 16, 1999
Polarization conversion element, polarization illuminator, display using the same illuminator, and projection type display
SEIKO EPSON CORP24 citations93
US6309073B1Oct 30, 2001
Projector
SEIKO EPSON CORP23 citations92
US6120152ASep 19, 2000
Projection-type display apparatus
SEIKO EPSON CORP31 citations92
US4680046AJul 14, 1987
Method of preparing preforms for optical fibers
SEIKO EPSON CORP33 citations91
US7445345B2Nov 4, 2008
Optical display device and projection-type display device
SEIKO EPSON CORP9 citations84
US7364305B2Apr 29, 2008
Projector
SEIKO EPSON CORP19 citations84
US7234822B2Jun 26, 2007
Light propagation structure and optical display device of optical system, light propagation method of optical system, and display method of optical display device
SEIKO EPSON CORP16 citations84
US7126736B2Oct 24, 2006
Illumination device, display device and projector
SEIKO EPSON CORP18 citations84
US6310723B1Oct 30, 2001
Polarization luminaire and projection display
SEIKO EPSON CORP10 citations82
US6348996B1Feb 19, 2002
Polarization illumination device and projector
SEIKO EPSON CORP11 citations74
US6204972B1Mar 20, 2001
Illumination optical system and projection-type display apparatus
SEIKO EPSON CORP9 citations74
US6109751AAug 29, 2000
Projector and lighting optical system therefor
SEIKO EPSON CORP15 citations74
US5973840AOct 26, 1999
Projection display and illuminating optical system for it
SEIKO EPSON CORP10 citations74
US11042079B2Jun 22, 2021
Projector
SEIKO EPSON CORP2 citations73
US10908487B1Feb 2, 2021
Light emitting device and projector
SEIKO EPSON CORP4 citations73
USRE36850ESep 5, 2000
Projection-type display apparatus
SEIKO EPSON CORP4 citations73
US4622056ANov 11, 1986
Method of preparing silica glass
SEIKO EPSON CORP17 citations72
US11619870B2Apr 4, 2023
Projector
SEIKO EPSON CORP0 citations63
US10261403B2Apr 16, 2019
Wavelength conversion element, light source apparatus, and projector
SEIKO EPSON CORP1 citations63
AISIN SEIKI
4 patentsUS6111490AAug 29, 2000
Superconducting magnet apparatus and method for magnetizing superconductor
AISIN SEIKI16 citations92
US7026901B2Apr 11, 2006
Superconducting magnet apparatus and method for magnetizing superconductor
AISIN SEIKI6 citations74
US6441710B1Aug 27, 2002
Superconducting magnet apparatus and method for magnetizing superconductor
AISIN SEIKI10 citations74
US4970487ANov 13, 1990
Pressure sensor
AISIN SEIKI11 citations73
ASAHI SEIKO CO LTD
1 patentSEIKO EPSON
1 patentDAIDO CONCRETE
1 patentShowing the top 50 of 68 patents by PatentIndex Score.