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USPTO Patent Rankings Data through Dec 31, 2025
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Stephen K. Eckhardt — 23 Patents

3M: 21 patents #629 of 11,543Top 6%
EYEyesee360: 1 patents #9 of 10Top 90%
White Bear Lake, MN: #27 of 561 inventorsTop 5%
Minnesota: #2,936 of 52,454 inventorsTop 6%
Overall (All Time): #178,160 of 4,157,543Top 5%
23 Patents All Time
Stephen K. Eckhardt has been granted 23 US patents while listed as an inventor at 3M. The first was granted in 1995 and the most recent in November 2017. Stephen K. Eckhardt ranks #178,160 of 4,157,543 US inventors in our database (top 4.3%). Patent records list Stephen K. Eckhardt in White Bear Lake, MN, US.

Issued Patents All Time

Showing 1–23 of 23 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
9816679 Light assembly Barry S. Carpenter, David A. Ender, David J. Lundin, Mark E. Napierala, Jennifer J. Sahlin +3 more 2017-11-14 $34,017,000
9229200 Panoramic optical systems 2016-01-05
9200775 Light assembly Barry S. Carpenter, David A. Ender, David J. Lundin, Mark E. Napierala, Jennifer J. Sahlin +3 more 2015-12-01 $20,880,000
8721153 Backlight reflectors having a prismatic structure Brian A. Kinder, Gary T. Boyd, Chun-Yi Ting, Han-Lin Tung, Linda M. Rivard +1 more 2014-05-13 $24,963,000
8675194 Apparatus for measuring the retroreflectance of materials Norbert L. Johnson 2014-03-18
7804649 Microreplicated achromatic lens James N. Dobbs 2010-09-28 $36,607,000
7684126 Fresnel field lens 2010-03-23 $39,099,000
7475991 Polarizing beamsplitter assembly Jiaying Ma, Michael K. Domroese, Glendon D. Kappel, Hamid R. Mortazavi, Michael J. Raykowski 2009-01-13 $31,894,000
7411734 Color-splitting optical element and an optical system utilizing the color-splitting optical element Simon Magarill 2008-08-12 $12,508,000
7329006 Projection system having low astigmatism David J. W. Aastuen, Charles L. Bruzzone, Jiaying Ma 2008-02-12 $13,174,000
7152981 Projection illumination system with tunnel integrator and field lens 2006-12-26 $21,625,000
6976759 Compound polarization beam splitters Simon Magarill, Charles L. Bruzzone, R. English, E. Gregory Fulkerson, Jiaying Ma +1 more 2005-12-20 $34,325,000
6857752 Projection illumination system with tunnel integrator and field lens 2005-02-22 $20,060,000
6719426 Compound polarization beam splitters Simon Magarill, Charles L. Bruzzone, R. English, E. Gregory Fulkerson, Jiaying Ma +1 more 2004-04-13 $19,032,000
6721096 Polarizing beam splitter Charles L. Bruzzone, David J. W. Aastuen, Roger J. Strharsky, Michael F. Weber, Gary T. Boyd 2004-04-13 $19,032,000
6672721 Projection system having low astigmatism David J. W. Aastuen, Charles L. Bruzzone, Jiaying Ma 2004-01-06 $26,856,000
6486997 Reflective LCD projection system using wide-angle Cartesian polarizing beam splitter Charles L. Bruzzone, David J. W. Aastuen, Roger J. Strharsky, Michael F. Weber, Gary T. Boyd 2002-11-26 $12,644,000
6104536 High efficiency polarization converter including input and output lenslet arrays 2000-08-15 $32,235,000
5803568 Dual grooved Fresnel lens for overhead projection 1998-09-08 $16,300,000
5596455 Fixed-focus triplet projection lens for overhead projectors 1997-01-21 $16,102,000
5515123 Condensers for illumination systems Dwight G. Baldwin 1996-05-07 $12,480,000
5475535 Condensers for overhead projectors 1995-12-12 $8,795,000
5400094 Condensers for overhead projectors 1995-03-21 $9,541,000