Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6062270 | Double-walled structure in a ventilation duct system | Teuvo Ranta, Hans Larsson | 2000-05-16 |
| 5911457 | Method for producing a double-walled structure | Teuvo Ranta | 1999-06-15 |
| 5881442 | Apparatus for making a double-walled structure | Teuvo Ranta | 1999-03-16 |
| 5801342 | Double-walled structure and method and arrangement for producing the same | Teuvo Ranta | 1998-09-01 |