Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5139730 | Method and apparatus for manufacturing ribbed pipe | Eino Holso, Jyri Jarvenkyla, Dieter Scharwachter, Lennart Agren | 1992-08-18 |
| 4933134 | Method and device for extrusion of a double wall plastics pipe | Jyri Jarvenkyla | 1990-06-12 |
| 4790975 | Method and device for extrusion of a double wall plastics pipe | Jyri Jarvenkyla | 1988-12-13 |