Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6282026 | Retroreflectors having two optical surfaces and varying retroreflectivity | Madeleine B. Fleming | 2001-08-28 |
| 6055108 | Imaging articles and methods using dual-axis retroreflective elements | — | 2000-04-25 |
| 6052164 | Electroluminescent display with brightness enhancement | Sanford Cobb, Jr. | 2000-04-18 |
| 6045230 | Modulating retroreflective article | Madeleine B. Fleming | 2000-04-04 |
| 5889615 | Dual axis retroreflective articles | Kenneth M. White, Vera L. Lightle | 1999-03-30 |
| 5745632 | Totally internally reflecting light conduit | — | 1998-04-28 |
| 5700077 | Line light source including fluorescent colorant | Thomas I. Bradshaw, David M. Burns, Lee A. Pavelka, Bruce D. Orensteen | 1997-12-23 |
| 5692822 | Uniform bi-directional dependent line light source via controlled partial reflection | — | 1997-12-02 |
| 5575550 | Pole light having a programmable footprint | Roger H. Appeldorn, Sanford Cobb, Jr. | 1996-11-19 |
| 5504544 | Projector with multiple lamp light source | Robert M. Fesler, Dennis F. Vanderwerf | 1996-04-02 |
| 5497294 | Conspicuity enhancer | — | 1996-03-05 |
| 5471348 | Directed reflection optical device | Richard A. Miller, Kenneth A. Aho | 1995-11-28 |
| 5258896 | Line light source | — | 1993-11-02 |
| 5135301 | Reflective overhead projector with alternate light sources | Dennis J. Roden | 1992-08-04 |
| 5043850 | Direction dependent line light source | — | 1991-08-27 |
| 5020173 | Bedstead storage box | — | 1991-06-04 |
| 4989948 | Reflective sheeting material | — | 1991-02-05 |
| 4984144 | High aspect ratio light fixture and film for use therein | Sanford Cobb, Jr. | 1991-01-08 |
| 4791540 | Light fixture providing normalized output | Neal T. Strand | 1988-12-13 |
| 4634246 | Automatic focus for overhead projector | — | 1987-01-06 |