Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6715508 | Drainage tile flow regulator | Charlie J. Schafer, Leo E. Beebout | 2004-04-06 |
| 6672626 | Corrugated pipe connection stabilizing apparatus | Charlie J. Schafer, Mark P. Gettler | 2004-01-06 |