Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875529 | Alternate forms of, side drive drilling | Stephen B. Wetch, Gregory A. Goris | 1989-10-24 |
| 4830121 | Break-out joint with selective disabler | John Moses | 1989-05-16 |
| 4795128 | Gate type kelly cock valve | Henry D. Calk, Jr., Taylor L. Jones, Billy L. McDougal | 1989-01-03 |