Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D463779 | Filter for a visual display monitor | Paul J. Cobian, Susan Olson, Lisa A. Helmer | 2002-10-01 |
| 6144479 | Low reflectivity contrast enhancement filter | Paul S. Lugg, Kenton D. Budd, John E. Bailey, Matthew H. Frey | 2000-11-07 |
| 5746408 | Hinged, adjustable mounting mechanism for an optical filter screen | Gerald E. Drake | 1998-05-05 |
| RE35691 | Adjustable mounting mechanism for an optical filter screen | Gerald E. Drake | 1997-12-16 |
| 5254388 | Light control film with reduced ghost images | Jeffrey J. Melby | 1993-10-19 |
| 5227916 | Adjustable mounting mechanism for an optical filter screen | Gerald E. Drake | 1993-07-13 |
| 5130848 | Passive railroad crossing warning system | Richard A. Miller, Kenneth A. Aho | 1992-07-14 |