Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4954935 | Lighting system for illuminating billboards and the like | Douglas S. Hammond | 1990-09-04 |
| 4451875 | Poster panel lighting fixture | John Green, Jan Shadwick | 1984-05-29 |