Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4442894 | Unitary float valve and wiping plug retainer | Rudy B. Callihan | 1984-04-17 |
| 4413682 | Method and apparatus for installing a cementing float shoe on the bottom of a well casing | Rudy B. Callihan | 1983-11-08 |
| 4393931 | Combination hydraulically set hanger assembly with expansion joint | John F. Muse, Rudy B. Callihan, Bobby F. Goad | 1983-07-19 |