Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4299403 | Wheeled carrier for hand luggage and the like | Hamilton C. de Jong | 1981-11-10 |
| 4287619 | Multi-purpose chair for the partially disabled | Hamilton C. de Jong | 1981-09-08 |
| D260583 | Chair for invalids | — | 1981-09-08 |