Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5494107 | Reverse cementing system and method | — | 1996-02-27 |
| 5295536 | Drilling mud container apparatus | — | 1994-03-22 |
| 5178214 | Restriction sub with deformable plastic sleeve | — | 1993-01-12 |
| 5165473 | Positive stop collar | — | 1992-11-24 |
| 5123484 | Pipe handling clamp | — | 1992-06-23 |
| 5105883 | Casing restriction sub | — | 1992-04-21 |
| 5095988 | Plug injection method and apparatus | — | 1992-03-17 |
| 5004048 | Apparatus for injecting displacement plugs | — | 1991-04-02 |
| 4930350 | Acoustical length measurement | Harlan L. Nicholson | 1990-06-05 |
| 4907649 | Restriction subs for setting cement plugs in wells | — | 1990-03-13 |
| 4674573 | Method and apparatus for placing cement plugs in wells | — | 1987-06-23 |