Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7104331 | Optical position sensing for well control tools | Terry R. Bussear, Michael A. Carmody, Don A. Hopmann, Edward Zisk, Michael W. Norris | 2006-09-12 |
| 6571501 | Pistol caliber conversion assembly | — | 2003-06-03 |
| 6000815 | Mechanically aligned lamp reflector assembly | — | 1999-12-14 |
| 5316084 | Well tool with sealing means | Douglas J. Murray, Robert Coon, Mark E. Hopmann, Ronald D. Williams, Timothy R. Tips | 1994-05-31 |
| 5309993 | Chevron seal for a well tool | Robert Coon, Mark E. Hopmann | 1994-05-10 |
| 5188183 | Method and apparatus for controlling the flow of well bore fluids | Mark E. Hopmann, Daniel E. Dinhoble | 1993-02-23 |