Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5390742 | Internally sealable perforable nipple for downhole well applications | Clark E. Robison, Perry C. Shy, William R. Welch | 1995-02-21 |
| 5361843 | Dedicated perforatable nipple with integral isolation sleeve | Perry C. Shy | 1994-11-08 |
| 5211241 | Variable flow sliding sleeve valve and positioning shifting tool therefor | Howard R. Mashaw, Jr., Robert C. Hammett, Clark E. Robison | 1993-05-18 |