Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D338245 | Autorotative throwing toy | — | 1993-08-10 |
| 5173069 | Autorotative flyer | Petrus A. M. Spierings | 1992-12-22 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D338245 | Autorotative throwing toy | — | 1993-08-10 |
| 5173069 | Autorotative flyer | Petrus A. M. Spierings | 1992-12-22 |