Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885927 | Method and apparatus for press forming intricate metallic shapes such as spool valve elements | William R. Corkin | 1989-12-12 |
| 4884660 | Process for simple and high speed oil change and crank case flushing in an internal combustion engine | — | 1989-12-05 |