Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4984969 | Plunger lift tool | — | 1991-01-15 |
| 4681160 | Apparatus for securing a measurement-while-drilling (MWD) instrument within a pipe | — | 1987-07-21 |
| 4531587 | Downhole flapper valve | — | 1985-07-30 |
| 4478286 | Equalizing valve for subterranean wells | — | 1984-10-23 |
| 4445572 | Unrestricted bore safety joint | Andrew Leo Haynes | 1984-05-01 |