Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871143 | Gate valve with supplemental actuator | — | 1989-10-03 |
| 4862426 | Method and apparatus for operating equipment in a remote location | Thomas G. Cassity, William C. Montgomery, Alfred W. Wedel, William M. Taylor | 1989-08-29 |
| 4844407 | Valve override mechanism | — | 1989-07-04 |
| 4837539 | Magnetic sensing proximity detector | — | 1989-06-06 |
| 4827963 | Heat sensitive shaft locking apparatus and valve using same | David R. Mefford | 1989-05-09 |