Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5029906 | Method and apparatus for forming a ventable seal | Charles A. Bollfrass | 1991-07-09 |
| 4893844 | Tubular coupling with ventable seal | Charles A. Bollfrass | 1990-01-16 |
| 4705307 | Tubular goods joint | — | 1987-11-10 |
| 4662659 | Tubular joint with trapped mid-joint metal-to-metal seal having unequal tapers | Thomas L. Blose, Donald J. Ortloff, Doyle E. Reeves | 1987-05-05 |
| 4591195 | Pipe joint | Merle E. Evans | 1986-05-27 |
| 4570982 | Tubular joint with trapped mid-joint metal-to-metal seal | Thomas L. Blose | 1986-02-18 |