Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6978844 | Filling and circulating apparatus for subsurface exploration | — | 2005-12-27 |
| 6510867 | Pressure relief valve | — | 2003-01-28 |
| 6460620 | Mudsaver valve | — | 2002-10-08 |
| 5435386 | Cementing plug | — | 1995-07-25 |
| 5433270 | Cementing plug | — | 1995-07-18 |
| 5361835 | Cementing plug | — | 1994-11-08 |
| 5348351 | Coupling apparatus | Donald R. Wade | 1994-09-20 |
| 5311940 | Cementing plug | — | 1994-05-17 |
| 5242018 | Cementing plug | — | 1993-09-07 |
| 5152554 | Coupling apparatus | Donald R. Wade | 1992-10-06 |