Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4671361 | Method and apparatus for hydraulically releasing from a gravel screen | — | 1987-06-09 |
| 4664188 | Retrievable well packer | Gary D. Zunkel, Lee W. Stepp | 1987-05-12 |
| 4662446 | Liner seal and method of use | David Paul Brisco | 1987-05-05 |
| 4662447 | Gravel packing method and apparatus | — | 1987-05-05 |
| 4638859 | Gravel packer | Gary D. Zunkel | 1987-01-27 |
| 4633944 | Gravel packer | Gary D. Zunkel | 1987-01-06 |