We believe that one cannot advance the state of the art without first mastering it, so we see this list as evidence of some of our expertise. One of our employees was either sole or co-inventor for each of these patents. Clicking on the patent number will take you to the pdf from the official USPTO website.
You may notice that none of these patents are assigned to Eckhardt Optics LLC. Many of the patents are assigned to 3M, because that’s where Steve worked for 18 years. More recently, we’ve been inventing things for customers, so the patents are assigned to them. How can we help you advance the state of the art?
| PAT. NO. | Title |
| 8,721,153 | Backlight reflectors having a prismatic structure |
| 8,675,194 | Apparatus for Measuring Retroreflectance of Materials |
| 7,804,649 | Microreplicated achromatic lens |
| 7,684,126 | Fresnel field lens |
| 7,475,991 | Polarizing beamsplitter assembly |
| 7,411,734 | Color-splitting optical element and an optical system utilizing the color-splitting optical element |
| 7,329,006 | Projection system having low astigmatism |
| 7,152,981 | Projection illumination system with tunnel integrator and field lens |
| 6,976,759 | Compound polarization beam splitters |
| 6,857,752 | Projection illumination system with tunnel integrator and field lens |
| 6,721,096 | Polarizing beam splitter |
| 6,719,426 | Compound polarization beam splitters |
| 6,672,721 | Projection system having low astigmatism |
| 6,486,997 | Reflective LCD projection system using wide-angle Cartesian polarizing beam splitter |
| 6,104,536 | High efficiency polarization converter including input and output lenslet arrays |
| 5,803,568 | Dual grooved Fresnel lens for overhead projection |
| 5,596,455 | Fixed-focus triplet projection lens for overhead projectors |
| 5,515,123 | Condensers for illumination systems |
| 5,475,535 | Condensers for overhead projectors |
| 5,400,094 | Condensers for overhead projectors |