Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877277 | Lever adapter for door knobs | — | 1989-10-31 |
| D303616 | Letter opener | — | 1989-09-26 |
| 4850976 | Combination sheath and foldable shield for hypodermic syringe needle | William P. Heinrich, Richard D. Brewer | 1989-07-25 |
| 4809141 | Illuminated paper tray | William P. Heinrich | 1989-02-28 |