Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866328 | Electric lamp with reduced internal photoelectron production | Daniel Shumway | 1989-09-12 |
| 4866342 | Metal halide lamp with improved lumen output | Matthew George | 1989-09-12 |