Inventor · disambiguated record
Takehiko Nakai
Also filed as: NAKAI TAKEHIKO
44 granted patents·2 pending applications·1,216 citations·filing 1990–2010
99Inventor score
Top patents by PatentIndex Score
46 records- 0191US6624943B2Diffractive optical element and optical system having the sameCANON KK·Filed 2001·Granted Sep 23, 2003·52 cites·58 claims
- 0291US6560019B2Diffractive optical element and optical system having the sameCANON KK·Filed 1999·Granted May 6, 2003·98 cites·21 claims
- 0390US8009355B2Optical element having periodic structure and optical apparatus using the sameCANON KK·Filed 2007·Granted Aug 30, 2011·21 cites·10 claims
- 0490US6927915B2Diffractive optical element, and optical system and optical apparatus provided with the sameCANON KK·Filed 2003·Granted Aug 9, 2005·45 cites·15 claims
- 0589US5503904AInvisible information recorded mediumCANON KK·Filed 1994·Granted Apr 2, 1996·67 cites·17 claims
- 0688US7075722B2Diffractive optical element and optical system having the sameCANON KK·Filed 2001·Granted Jul 11, 2006·37 cites·6 claims
- 0788US6873463B2Diffractive optical element and optical system having the sameCANON KK·Filed 2001·Granted Mar 29, 2005·37 cites·25 claims
- 0888US6829093B1Diffraction optical elementCANON KK·Filed 2000·Granted Dec 7, 2004·36 cites·11 claims
- 0988US6486974B1Image reading deviceCANON KK·Filed 2000·Granted Nov 26, 2002·48 cites·2 claims
- 1087US6650477B2Diffractive optical element and optical apparatus having the sameCANON KK·Filed 2001·Granted Nov 18, 2003·34 cites·8 claims
- 1186US6262846B1Diffractive optical element and optical system having the sameCANON KK·Filed 1998·Granted Jul 17, 2001·59 cites·11 claims
- 1285US6330110B2Diffractive optical element and optical system having the sameCANON KK·Filed 2001·Granted Dec 11, 2001·25 cites·12 claims
- 1381US6094281AImage reading device with offset faces for visible and non-visible light sensorsCANON KK·Filed 1997·Granted Jul 25, 2000·62 cites·19 claims
- 1480US7301702B2Diffractive optical element and optical system including the sameCANON KK·Filed 2005·Granted Nov 27, 2007·7 cites·8 claims
- 1580US7236302B2Diffraction optical elementCANON KK·Filed 2005·Granted Jun 26, 2007·10 cites·21 claims
- 1679US5471281AImage reading apparatus and copying apparatus having means for radiating visible and non-visible light, image processing apparatus having means for discriminating a specific orginal and image processing method thereforCANON KK·Filed 1993·Granted Nov 28, 1995·39 cites·28 claims
- 1778US6122104ADiffractive optical element and optical system having the sameCANON KK·Filed 1998·Granted Sep 19, 2000·39 cites·17 claims
- 1878US5617187AImage reading apparatus, copying apparatus, image processing apparatus, and image processing methodCANON KK·Filed 1995·Granted Apr 1, 1997·24 cites·18 claims
- 1976US6760159B2Diffractive optical element and optical system having the sameCANON KK·Filed 2000·Granted Jul 6, 2004·15 cites·13 claims
- 2075US5724152AImage reading apparatus and image processing apparatus for reading optical information of visible and non-visible lightCANON KK·Filed 1993·Granted Mar 3, 1998·38 cites·26 claims
- 2173US5481334AImage processing apparatus having means for detecting non-visible light, and image processing method thereforCANON KK·Filed 1993·Granted Jan 2, 1996·28 cites·22 claims
- 2272US6051826APhotosensor with filter for cutting off the input of invisible informationCANON KK·Filed 1997·Granted Apr 18, 2000·40 cites·10 claims
- 2372US5650863AImage reading and copying using plural illumination sources having different characteristicsCANON KK·Filed 1995·Granted Jul 22, 1997·43 cites·52 claims
- 2471US5113067AImage reading apparatus having a blazed diffraction gratingCANON KK·Filed 1990·Granted May 12, 1992·31 cites·27 claims
- 2568US5737113AOptical modulators and color image display device employing the sameCANON KK·Filed 1996·Granted Apr 7, 1998·38 cites·56 claims
- 2667US5763891ANon-visualized information recording medium and apparatus for detecting the sameCANON KK·Filed 1997·Granted Jun 9, 1998·34 cites·23 claims
- 2766US6480332B1Diffractive optical element and optical system having the sameCANON KK·Filed 1998·Granted Nov 12, 2002·28 cites·11 claims
- 2864US6201616B1Method and apparatus for determining a predetermined pattern on an original based on visible and invisible information on the originalCANON KK·Filed 1997·Granted Mar 13, 2001·27 cites·87 claims
- 2963US6757104B2Picture taking apparatus having diffractive optical elementCANON KK·Filed 2001·Granted Jun 29, 2004·8 cites·11 claims
- 3063US5362957AImage reading apparatusCANON KK·Filed 1993·Granted Nov 8, 1994·21 cites·18 claims
- 3162US8279526B2Optical system and image pickup apparatus having sameMOMOKI KAZUHIKO·Filed 2008·Granted Oct 2, 2012·3 cites·5 claims
- 3262US6590708B2Lens system having diffracting surface and refracting surface and optical apparatus using the lens systemCANON KK·Filed 1997·Granted Jul 8, 2003·16 cites·27 claims
- 3358US7612941B2Diffractive optical element and optical system including the sameCANON KABUHSIKI KAISHA·Filed 2007·Granted Nov 3, 2009·1 cites·1 claims
- 3458US7554735B2Diffractive optical element and optical system including the sameCANON KK·Filed 2007·Granted Jun 30, 2009·1 cites·1 claims
- 3558US5631723AImage processing apparatus for determining whether an image contains a particular pattern using invisible lightCANON KK·Filed 1996·Granted May 20, 1997·18 cites·37 claims
- 3657US7626772B2Optical system and optical apparatus having the sameCANON KK·Filed 2008·Granted Dec 1, 2009·1 cites·20 claims
- 3757US6930833B2Diffractive optical element, and optical system and optical apparatus provide with the sameCANON KK·Filed 2003·Granted Aug 16, 2005·5 cites·12 claims
- 3855US6587272B2Diffractive optical elementCANON KK·Filed 1999·Granted Jul 1, 2003·17 cites·32 claims
- 3955US6078682AImage processing apparatus and method, and image reading apparatusCANON KK·Filed 1996·Granted Jun 20, 2000·24 cites·24 claims
- 4054US6153879AInvisible information detecting apparatusCANON KK·Filed 1996·Granted Nov 28, 2000·13 cites·12 claims
- 4148US6565212B2Projection display apparatus, and information processing system and image recording/reproducing system using the sameCANON KK·Filed 2001·Granted May 20, 2003·1 cites·18 claims
- 4243US6507437B1Diffractive optical element and photographic optical system having the sameCANON KK·Filed 1999·Granted Jan 14, 2003·10 cites·10 claims
- 4343US5187606AScanning optical apparatusCANON KK·Filed 1990·Granted Feb 16, 1993·10 cites·28 claims
- 4440US2010302642A1Optical element and optical system including the sameCANON KK·Filed 2010·Application pending·0 cites
- 4539US6028705AImage reading apparatus with reflection type blazed diffraction grating for color separationCANON KK·Filed 1994·Granted Feb 22, 2000·5 cites·33 claims
- 4630US2001038503A1Diffractive optical element and optical system having the sameFiled 1999·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →