Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5582200 | Gate valve with spring assisted valve liner | Alvin A. Kimpel | 1996-12-10 |
| 5413140 | Spring-assisted split seat gate valve | Alvin A. Kimpel | 1995-05-09 |
| 5271426 | Gate valve | Curtis W. Clarkson, Larry F. Koll, Nicholas J. Williams | 1993-12-21 |