Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4280625 | Shade determination | Jacobus H. Grobbelaar, Richard N. Colson, Charlie M. Levitt | 1981-07-28 |
| 4186838 | Measurement of optical properties | Charlie M. Levitt | 1980-02-05 |