Issued Patents All Time
Showing 1–25 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6582084 | Projector having an inverted head optical arrangement | Patricia DeLuca | 2003-06-24 |
| 6530664 | Integrated front projection system with enhanced dry erase screen configuration | Patricia M. Hughes, Ernesto M. Rodriguez, Jr. | 2003-03-11 |
| 6394609 | Integrated front projection system | Ernesto M. Rodriguez, Jr. | 2002-05-28 |
| 6179426 | Integrated front projection system | Ernesto M. Rodriguez, Jr. | 2001-01-30 |
| 6024452 | Prismatic light beam homogenizer for projection displays | Alan J. Herbert | 2000-02-15 |
| 5995284 | Polarized illumination system for LCD projector | — | 1999-11-30 |
| 5940149 | Planar polarizer for LCD projectors | — | 1999-08-17 |
| 5568324 | Overhead projector with catadioptric fresnel lens | John C. Nelson, Robert M. Fesler | 1996-10-22 |
| 5504544 | Projector with multiple lamp light source | John F. Dreyer, Jr., Robert M. Fesler | 1996-04-02 |
| 5453880 | Overhead projector with achromatic Fresnel lens | — | 1995-09-26 |
| 5446594 | Catadioptric Fresnel lens | John C. Nelson | 1995-08-29 |
| 5317349 | Overhead projector with achromatic fresnel lens | — | 1994-05-31 |
| 5296882 | Overhead projector with catadioptric fresnel lens | John C. Nelson, Robert M. Fesler | 1994-03-22 |
| 5092672 | Condenser lens system for overhead projector | — | 1992-03-03 |
| 4986651 | Overhead projector with centerless Fresnel lens reflective stage | — | 1991-01-22 |
| 4900129 | Dual grooved Fresnel lens for overhead projection | — | 1990-02-13 |
| 4867555 | Retrofocus lens for overhead projector | — | 1989-09-19 |
| 4800868 | Tilted panel linear echelon solar collector | Roger H. Appeldorn | 1989-01-31 |
| 4744641 | Telephoto lens assembly for overhead projector | — | 1988-05-17 |
| 4741613 | Reduced height transmissive overhead projector | — | 1988-05-03 |
| 4719547 | Illumination system for overhead projector | — | 1988-01-12 |
| D288571 | Rear-projection lectern | — | 1987-03-03 |
| 4561740 | Dual-magnification rear projection lectern | — | 1985-12-31 |
| 4436392 | Distortion correction for an overhead projector system | — | 1984-03-13 |
| 4436393 | Distortion correction for an overhead projector system | — | 1984-03-13 |