Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7407011 | Tubing annulus plug valve | — | 2008-08-05 |
| 6668933 | Ball valve seat and support | — | 2003-12-30 |
| 6454015 | Shearing gate valve | John T. Armstrong, Jr., Ian Gourlay, Chau Hoang | 2002-09-24 |
| 5638903 | Adjustable mandrel hanger system | — | 1997-06-17 |
| 5607019 | Adjustable mandrel hanger for a jackup drilling rig | — | 1997-03-04 |
| 5375812 | Dynamic metal-to-metal seal | — | 1994-12-27 |
| 5370362 | Gate valve | Anton J. Dach, Jr., Hernani G. DeOcampo, Ted D. Williams | 1994-12-06 |
| 5311947 | Preselected casing tensioning system | Norman Brammer | 1994-05-17 |
| 5307879 | Positive lockdown for metal seal | — | 1994-05-03 |
| 4949786 | Emergency casing hanger | Lawrence A. Eckert, Graeme Johnston | 1990-08-21 |
| 4728844 | Piezoelectric transducer and components therefor | Paul Wilson, Duncan Stewart, Robert Crocker | 1988-03-01 |