Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5031923 | Valve stem seal | — | 1991-07-16 |
| 4869319 | Wellhead structure | Edward J. Szymozak, Thomas G. Cassity, William M. Taylor, Peer H. Tiemer, Larry M. Hoes +1 more | 1989-09-26 |