Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859899 | Metal-halide lamp having heat redistribution means | William M. Keeffe, Zeya K. Krasko, Robert J. Karlotski | 1989-08-22 |
| 4850499 | Method to reduce color temperature variation in metal halide arc tubes | Philip J. White, William M. Keeffe | 1989-07-25 |
| 4850500 | Dimpled arc tube having no internal end pockets and a lamp employing same | Philip J. White, William M. Keeffe | 1989-07-25 |