Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881311 | Heat exchanger assembly with integral fin unit | Roger Paulman | 1989-11-21 |
| 4794985 | Finned heat exchanger tubing with varying wall thickness | Roger Paulman | 1989-01-03 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881311 | Heat exchanger assembly with integral fin unit | Roger Paulman | 1989-11-21 |
| 4794985 | Finned heat exchanger tubing with varying wall thickness | Roger Paulman | 1989-01-03 |