Inventor · disambiguated record
Stephen K. Eckhardt
Also filed as: ECKHARDT STEPHEN · ECKHARDT STEPHEN K
23 granted patents·2 pending applications·893 citations·filing 1993–2016
96Inventor score
Files with3M INNOVATIVE PROPERTIES CO15MINNESOTA MINING & MFG5ECKHARDT STEPHEN K2EYESEE360 INC1KINDER BRIAN A1
Top patents by PatentIndex Score
25 records- 0198US6721096B2Polarizing beam splitter3M INNOVATIVE PROPERTIES CO·Filed 2002·Granted Apr 13, 2004·198 cites·26 claims
- 0298US6486997B1Reflective LCD projection system using wide-angle Cartesian polarizing beam splitter3M INNOVATIVE PROPERTIES CO·Filed 1999·Granted Nov 26, 2002·348 cites·25 claims
- 0396US6719426B2Compound polarization beam splitters3M INNOVATIVE PROPERTIES CO·Filed 2003·Granted Apr 13, 2004·106 cites·22 claims
- 0491US6672721B2Projection system having low astigmatism3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted Jan 6, 2004·41 cites·102 claims
- 0588US6976759B2Compound polarization beam splitters3M INNOVATIVE PROPERTIES CO·Filed 2004·Granted Dec 20, 2005·34 cites·22 claims
- 0682US7411734B2Color-splitting optical element and an optical system utilizing the color-splitting optical element3M INNOVATIVE PROPERTIES CO·Filed 2005·Granted Aug 12, 2008·11 cites·20 claims
- 0781US7804649B2Microreplicated achromatic lens3M INNOVATIVE PROPERTIES CO·Filed 2005·Granted Sep 28, 2010·11 cites·19 claims
- 0881US6857752B2Projection illumination system with tunnel integrator and field lens3M INNOVATIVE PROPERTIES CO·Filed 2003·Granted Feb 22, 2005·13 cites·58 claims
- 0978US7684126B2Fresnel field lens3M INNOVATIVE PROPERTIES CO·Filed 2006·Granted Mar 23, 2010·8 cites·23 claims
- 1078US7475991B2Polarizing beamsplitter assembly3M INNOVATIVE PROPERTIES CO·Filed 2005·Granted Jan 13, 2009·7 cites·17 claims
- 1177US7329006B2Projection system having low astigmatism3M INNOVATIVE PROPERTIES CO·Filed 2003·Granted Feb 12, 2008·11 cites·13 claims
- 1276US6104536AHigh efficiency polarization converter including input and output lenslet arrays3M INNOVATIVE PROPERTIES CO·Filed 1998·Granted Aug 15, 2000·45 cites·25 claims
- 1372US9200775B2Light assemblyECKHARDT STEPHEN K·Filed 2010·Granted Dec 1, 2015·4 cites·20 claims
- 1470US8721153B2Backlight reflectors having a prismatic structureKINDER BRIAN A·Filed 2008·Granted May 13, 2014·7 cites·17 claims
- 1570US8675194B2Apparatus for measuring the retroreflectance of materialsECKHARDT STEPHEN K·Filed 2011·Granted Mar 18, 2014·2 cites·6 claims
- 1668US7152981B2Projection illumination system with tunnel integrator and field lens3M INNOVATIVE PROPERTIES CO·Filed 2004·Granted Dec 26, 2006·6 cites·23 claims
- 1760US5596455AFixed-focus triplet projection lens for overhead projectorsMINNESOTA MINING & MFG·Filed 1995·Granted Jan 21, 1997·22 cites·20 claims
- 1853US9816679B2Light assembly3M INNOVATIVE PROPERTIES CO·Filed 2015·Granted Nov 14, 2017·0 cites·12 claims
- 1952US9229200B2Panoramic optical systemsEYESEE360 INC·Filed 2013·Granted Jan 5, 2016·0 cites·18 claims
- 2045US2005140932A1Compound polarization beam splitters3M INNOVATIVE PROPERTIES CO·Filed 2005·Application pending·0 cites
- 2141US5803568ADual grooved Fresnel lens for overhead projectionMINNESOTA MINING & MFG·Filed 1995·Granted Sep 8, 1998·9 cites·13 claims
- 2235US5515123ACondensers for illumination systemsMINNESOTA MINING & MFG·Filed 1994·Granted May 7, 1996·5 cites·20 claims
- 2335US5400094ACondensers for overhead projectorsMINNESOTA MINING & MFG·Filed 1993·Granted Mar 21, 1995·4 cites·11 claims
- 2431US5475535ACondensers for overhead projectorsMINNESOTA MINING & MFG·Filed 1994·Granted Dec 12, 1995·1 cites·9 claims
- 2529US2016195723A1Methods and apparatus for reflected display of imagesSEEBRIGHT INC·Filed 2016·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →