Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6936126 | Method of manufacture of a drip irrigation hose | Michael DeFrank, David L. Teegardin | 2005-08-30 |
| 6464816 | Method and apparatus for making a drip irrigation hose | Michael DeFrank, David L. Teegardin | 2002-10-15 |
| 5865377 | Drip irrigation hose and method for its manufacture | Michael DeFrank, David L. Teegardin | 1999-02-02 |
| 5634595 | Drip irrigation hose and method for its manufacture | Michael DeFrank, David L. Teegardin | 1997-06-03 |
| 5522551 | Drip irrigation hose and method for its manufacture | Michael DeFrank, David L. Teegardin | 1996-06-04 |