Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870233 | Metal tray and susceptor combination for use in microwave ovens | Duane Lyle McDonald | 1989-09-26 |
| D303137 | Non-lethal self defense weapon | — | 1989-08-29 |
| 4809643 | Gas distribution system for muffle-type furnaces | Boris Plesinger | 1989-03-07 |