Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5855324 | Drip irrigation hose and method of its manufacture | Michael DeFrank, Shawn Shirvan | 1999-01-05 |
| 5722601 | Drip irrigation hose and method of its manufacture | Michael DeFrank, Shawn Shirvan | 1998-03-03 |