Inventor
YOSHIKAWA HIROKI
JP113 patents
⚠️ This page may combine multiple inventors who share the name “YOSHIKAWA HIROKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
31 patentsUS6130786AOct 10, 2000
Projection lens and image display device
HITACHI LTD125 citations99
US5926153AJul 20, 1999
Multi-display apparatus
HITACHI LTD93 citations97
US5613748AMar 25, 1997
Rear projection type image display apparatus and transmission type screen used therein
HITACHI LTD48 citations96
US5590943AJan 7, 1997
Rear projection type image display apparatus and transmission type screen used therein
HITACHI LTD49 citations96
US5513037AApr 30, 1996
Rear-projection screen and a rear projection image display employing the rear-projection screen
HITACHI LTD47 citations96
US5066099ANov 19, 1991
Rear projection screen and method of producing the same
HITACHI LTD136 citations95
US5485308AJan 16, 1996
Rear-projection type image display apparatus and rear-projection type screen
HITACHI LTD70 citations94
US7535648B2May 19, 2009
Projection type image display
HITACHI LTD20 citations93
US7245429B2Jul 17, 2007
Image display device, rear projection type screen used in image display device, Fresnel lens sheet, and method of making Fresnel lens sheet
HITACHI LTD20 citations92
US6201516B1Mar 13, 2001
Projector, projecting system, system for sensation and method of manufacturing translucent screen
HITACHI LTD25 citations92
US5833340ANov 10, 1998
Sensory integration system and image display device and concave mirror for use in the same system
HITACHI LTD27 citations92
US5659424AAug 19, 1997
Projecting lens and image display device
HITACHI LTD29 citations92
US5400114AMar 21, 1995
Rear-projection screen and a rear projection image display employing the rear-projection screen
HITACHI LTD36 citations92
US5272540ADec 21, 1993
Temperature compensating lens system for projection television
HITACHI LTD37 citations92
US5200814AApr 6, 1993
Video projector with optical color balance
HITACHI LTD21 citations92
US5103302AApr 7, 1992
Optical system for projection type image display device
HITACHI LTD39 citations92
US4948237AAug 14, 1990
Projection lens system
HITACHI LTD28 citations92
US6462794B1Oct 8, 2002
Image forming unit, enlarging unit, optical parts, and image display apparatus having these components
HITACHI LTD46 citations91
US4638643AJan 27, 1987
Control system for compressor motor used with air-conditioning unit
HITACHI LTD51 citations91
US5808704ASep 15, 1998
Rear projection type image display apparatus
HITACHI LTD33 citations89
US7670007B2Mar 2, 2010
Projection display, projection optical system and transmission lens or free curved lens
HITACHI LTD8 citations84
US7586687B2Sep 8, 2009
Projecting optical unit and projecting type image display apparatus therewith
HITACHI LTD12 citations84
US7467872B2Dec 23, 2008
Projection optical unit and projection type video display device using the unit
HITACHI LTD16 citations84
US7362503B2Apr 22, 2008
Screen, Fresnel lens sheet used for the same, and image display apparatus using the same
HITACHI LTD7 citations74
US7261421B2Aug 28, 2007
Optical projector and image display apparatus using the same
HITACHI LTD8 citations74
US5933280AAug 3, 1999
Projection lens and image display device
HITACHI LTD7 citations74
US4824224AApr 25, 1989
Lens system for a cathode ray tube projection system
HITACHI LTD8 citations74
US7460301B2Dec 2, 2008
Image display apparatus, and transmissive screen and reflecting mirror used for same
HITACHI LTD8 citations73
US7961400B2Jun 14, 2011
Projecting optical unit and projecting type image display apparatus therewith
HITACHI LTD2 citations63
US7095558B2Aug 22, 2006
Image display device, rear projection type screen used in image display device, Fresnel lens sheet, and method of making Fresnel lens sheet
HITACHI LTD4 citations63
US6798580B2Sep 28, 2004
Projection type image display apparatus
HITACHI LTD4 citations63
SHINETSU CHEMICAL CO
13 patentsUS6275336B1Aug 14, 2001
Optical isolator
SHINETSU CHEMICAL CO20 citations93
US7771893B2Aug 10, 2010
Photomask blank, photomask and fabrication method thereof
SHINETSU CHEMICAL CO28 citations92
US7767366B2Aug 3, 2010
Photomask blank and photomask
SHINETSU CHEMICAL CO34 citations92
US7736824B2Jun 15, 2010
Photomask blank, photomask, and method of manufacture
SHINETSU CHEMICAL CO26 citations92
US7790339B2Sep 7, 2010
Photomask blank
SHINETSU CHEMICAL CO8 citations84
US7691546B2Apr 6, 2010
Photomask blank and photomask
SHINETSU CHEMICAL CO10 citations84
US7625676B2Dec 1, 2009
Photomask blank, photomask and fabrication method thereof
SHINETSU CHEMICAL CO13 citations84
US7618753B2Nov 17, 2009
Photomask blank, photomask and method for producing those
SHINETSU CHEMICAL CO8 citations84
US8012654B2Sep 6, 2011
Photomask blank and photomask
SHINETSU CHEMICAL CO11 citations83
US8003284B2Aug 23, 2011
Photomask blank and photomask
SHINETSU CHEMICAL CO9 citations83
US10529984B2Jan 7, 2020
Negative electrode material for non-aqueous electrolyte secondary battery and method of producing negative electrode active material particles
SHINETSU CHEMICAL CO2 citations73
US9893353B2Feb 13, 2018
Negative electrode material for nonaqueous electrolyte secondary batteries, and secondary battery
SHINETSU CHEMICAL CO2 citations73
US7622227B2Nov 24, 2009
Phase-shift photomask-blank, phase-shift photomask and fabrication method thereof
SHINETSU CHEMICAL CO3 citations63
TOPPAN PRINTING CO LTD
2 patentsSHIN ESTU CHEMICAL CO LTD
1 patentNAT UNIV CORP HOKKAIDO UNIV
1 patentHONDA MOTOR CO LTD
1 patentPANASONIC CORP
1 patentShowing the top 50 of 113 patents by PatentIndex Score.