Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12398743 | System of tubular connections | — | 2025-08-26 |
| 4967569 | Portable air-conditioning unit for through-hatch marine use | Edmund H. Machen | 1990-11-06 |
| 4483538 | Tamperproof reusable bingo card | Earl L. Koppen | 1984-11-20 |
| 4361328 | Sheet interfitting section puzzle | Age Stein | 1982-11-30 |