Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5890700 | Gate valve | Nicholas J. Williams | 1999-04-06 |
| 5370149 | Line blind valve | Larry F. Koll, Nicholas J. Williams | 1994-12-06 |
| 5271426 | Gate valve | Larry F. Koll, Milton E. Jennings, Nicholas J. Williams | 1993-12-21 |
| 4846442 | Gate valve with lock ring | Larry F. Koll | 1989-07-11 |
| 4688597 | Gate valve | Larry F. Koll | 1987-08-25 |
| 4257447 | Gate valve | — | 1981-03-24 |