Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889017 | Rotary drill bit for use in drilling holes in subsurface earth formations | Joseph A. Gasan | 1989-12-26 |
| D302754 | Animal feeder | — | 1989-08-08 |
| 4823892 | Rotary drill bits | — | 1989-04-25 |