Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7100893 | Gate valve | Christopher Eric Cooper, Lawrence J. Burrow, Joanne L. Dickson | 2006-09-05 |
| 5890700 | Gate valve | Curtis W. Clarkson | 1999-04-06 |
| 5370149 | Line blind valve | Curtis W. Clarkson, Larry F. Koll | 1994-12-06 |
| 5271426 | Gate valve | Curtis W. Clarkson, Larry F. Koll, Milton E. Jennings | 1993-12-21 |