Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4542319 | Mercury dispenser for electric discharge lamps | Julian P. Grenfell | 1985-09-17 |
| 4326324 | Manufacture of electric light sources | — | 1982-04-27 |
| 4184728 | Coaxial seal and tip off burners | Julian P. Grenfell | 1980-01-22 |