Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5975143 | Method for manufacturing a corrugated pipe, and a corrugated pipe manufactured by the method | Jyri Jarvenkyla, Björn Olsson, Lennart gren | 1999-11-02 |
| 5589127 | Method and apparatus for forming ribs with sideward projections in a plastic pipe, and a plastic pipe | Jyri Jarvenkyla, Ake Johansson, Ronny Kristensson | 1996-12-31 |
| 5171500 | Pipe manufacturing line | Jyri Jarvenkyla | 1992-12-15 |
| 5139730 | Method and apparatus for manufacturing ribbed pipe | Paul Holso, Eino Holso, Jyri Jarvenkyla, Lennart Agren | 1992-08-18 |