Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4358956 | Liquid level indicator | Samuel Ruben | 1982-11-16 |
| 4227410 | Attitude compensating indicator | Samuel Ruben | 1980-10-14 |
| 4207766 | Attitude compensating liquid content indicator | Samuel Ruben | 1980-06-17 |