Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6758281 | Methods and apparatus for creating a downhole buoyant casing chamber | Henry E. Rogers | 2004-07-06 |
| 6651748 | Methods and apparatus for creating a downhole buoyant casing chamber | Henry E. Rogers | 2003-11-25 |
| 6505685 | Methods and apparatus for creating a downhole buoyant casing chamber | Henry E. Rogers | 2003-01-14 |
| 6244342 | Reverse-cementing method and apparatus | David D. Szarka | 2001-06-12 |
| 5762139 | Subsurface release cementing plug apparatus and methods | David F. Laurel, George L. Morgan, David D. Szarka | 1998-06-09 |
| 5722491 | Well cementing plug assemblies and methods | David F. Laurel | 1998-03-03 |
| 5647434 | Floating apparatus for well casing | Henry E. Rogers, Dick A. Murray | 1997-07-15 |
| 5641021 | Well casing fill apparatus and method | Dick A. Murray, Henry E. Rogers, Earl Webb | 1997-06-24 |
| 5472053 | Leakproof floating apparatus and method for fabricating said apparatus | Henry E. Rogers, Dick A. Murray | 1995-12-05 |
| 5364110 | Downhole tool metal-to-metal seal | Steven G. Streich, John T. Brandell, David D. Szarka | 1994-11-15 |