Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10161227 | Permanent bypass whipstock assembly for drilling and completing a sidetrack well and preserving access to the original wellbore | David G. Hearn, Dan E. Venhaus, John G. Eller | 2018-12-25 |
| 9371694 | Permanent bypass whipstock assembly for drilling and completing a sidetrack well and preserving access to the original wellbore | David D. Hearn, Dan E. Venhaus, John G. Eller | 2016-06-21 |
| 8256535 | Mill-through tailpipe liner exit and method of use thereof | David D. Hearn, Howard Gober | 2012-09-04 |
| 5725060 | Mill starting device and method | Curtis G. Blount, David D. Hearn, Gregory S. Walz | 1998-03-10 |
| 5332037 | Squeeze cementing method for wells | Joseph H. Schmidt, William H. Smalstig | 1994-07-26 |