Issued Patents All Time
Showing 151–157 of 157 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6142224 | Triple action pumping system with plunger valves | Lon A. Stuebinger, Howard L. McKinzie | 2000-11-07 |
| 5899270 | Side intake valve assembly | — | 1999-05-04 |
| 5522458 | High pressure cementing plug assemblies | David Paul Brisco | 1996-06-04 |
| 5398763 | Wireline set baffle and method of setting thereof | James Frederick Pyecroft, David D. Brisco, Rick L. Middaugh, Paul W. Roden, Donald F. Hushbeck +2 more | 1995-03-21 |
| 5127472 | Indicating ball catcher | Joseph S. Squyres, Alfred H. Jones, William Jeffrey May, T. Austin Freeman | 1992-07-07 |
| 5095980 | Non-rotating cementing plug with molded inserts | — | 1992-03-17 |
| 4858687 | Non-rotating plug set | T. Austin Freeman | 1989-08-22 |