Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861394 | Controlled slow cooling of steel tubulars | Joseph F. Colin, Charles D. Roberts | 1989-08-29 |
| 4798368 | Apparatus for controlled slow cooling of steel tubulars | Joseph F. Colin, Charles D. Roberts | 1989-01-17 |