Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882929 | Apparatus and process for measuring changes in effect of tidal forces | — | 1989-11-28 |
| 4842235 | Automobile clip board and light unit | George Spector | 1989-06-27 |
| 4796469 | Apparatus and process for measuring change of liquid level in storage tanks | Roger W. Richesson | 1989-01-10 |