Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854386 | Method and apparatus for stage cementing a liner in a well bore having a casing | Samuel F. Baker | 1989-08-08 |
| 4834185 | Method and apparatus for manipulating a well bore liner | — | 1989-05-30 |