Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4726422 | Annular safety assembly for an oil well, especially a double production zone well | Paul M. Helderle | 1988-02-23 |
| 4566541 | Production tubes for use in the completion of an oil well | Jacques L. Moussy | 1986-01-28 |