Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5012753 | Mechanism for tensioning a fabric platform | David Michael Grassi | 1991-05-07 |
| 4920909 | Boat with rotatable wheel keel for resistance to leeward movement in water and for sand transport | David Michael Grassi | 1990-05-01 |