Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887564 | Valve actuation system for desmodromic internal combustion engines | — | 1989-12-19 |
| 4838818 | Friction steering drive system for electric fishing motors | — | 1989-06-13 |
| 4805568 | Swing valve for internal combustion engines | Joseph E. Springer | 1989-02-21 |