Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6896061 | Multiple zones frac tool | Iosif Hriscu, Don S. Folds, Gregory W. Vargus, John T. Brandell | 2005-05-24 |
| 6220349 | Low pressure, high temperature composite bridge plug | Gregory W. Vargus, Donald F. Hushbeck, Kevin T. Berscheidt, Donny Winslow, Donald R. Smith | 2001-04-24 |
| 6113158 | Pipe joint coupling | Brian Bocchicchio, Brian Winslett | 2000-09-05 |
| 6056533 | Apparatus for conduit extrusion | Michael Schäfer, Jesse Ellison | 2000-05-02 |
| 5547230 | Joint for variable wall thickness conduit | Michael Bank | 1996-08-20 |
| 5362112 | Pipe joint construction and coupling therefor | Larry J. Hamilton, Richard P. Shortman | 1994-11-08 |
| 5096528 | Method of forming chamfered spigot end on pipe | Fred Durrenberger, William W. Howze | 1992-03-17 |