Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4236299 | Method and device for winding spiral fins onto oval tubing | Hans Langen, Peter Denner | 1980-12-02 |
| 4194381 | Device for the cold working of heat exchanger tubing for the attachment of spiral fins | — | 1980-03-25 |