Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864181 | Electric incandescent lamp having truncated conical filament and a mirror coating | Antonius J. Huijbers | 1989-09-05 |
| 4797302 | Electric lamp having a mirror-coated lamp vessel | Albert J. Westerhof | 1989-01-10 |