Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5697768 | Downhole swivel | — | 1997-12-16 |
| 5645896 | Method of applying a filled in metal carbide hard facing to the rotor of a progressing cavity pump | — | 1997-07-08 |
| 5639227 | Seal arrangement for the drivehead of a downhole rotary pump | — | 1997-06-17 |
| 5631961 | Device for and method of cryptography that allows third party access | Mark R. Unkenholz, Mark Wilson, John E. Burroughs | 1997-05-20 |