Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875524 | Casing centralizer | Richard L. Giroux, Allen T. Joyce | 1989-10-24 |
| 4809776 | Sub-surface release plug assembly | — | 1989-03-07 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875524 | Casing centralizer | Richard L. Giroux, Allen T. Joyce | 1989-10-24 |
| 4809776 | Sub-surface release plug assembly | — | 1989-03-07 |