Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4558721 | Double walled tubing | Gerald R. Trudell, Dennis W. Barber | 1985-12-17 |
| 4483061 | Double walled tubing and process for producing same | Gerald R. Trudell, Dennis W. Barber | 1984-11-20 |