Issued Patents All Time
Showing 51–61 of 61 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4988466 | Method and an apparatus for the production of ribbed pipes | — | 1991-01-29 |
| 4952362 | Method and apparatus for the production of pipe | Pauli Sillanpaa | 1990-08-28 |
| 4933134 | Method and device for extrusion of a double wall plastics pipe | Paul Holso | 1990-06-12 |
| D307790 | Tube or the like | Gunnar Björkman | 1990-05-08 |
| D307174 | Tube or the like | Gunnar Björkman | 1990-04-10 |
| 4873048 | Method for the formation of a hole in a plastic pipe | — | 1989-10-10 |
| 4867928 | Apparatus and a method for the production of ribbed pipes | Ingemar Carlsson | 1989-09-19 |
| 4865797 | Method and an apparatus for the extrusion of plastic pipes | — | 1989-09-12 |
| 4790975 | Method and device for extrusion of a double wall plastics pipe | Paul Holso | 1988-12-13 |
| 4721594 | Method and an apparatus for the production of ribbed pipes | — | 1988-01-26 |
| 4690174 | Plastic pipe | — | 1987-09-01 |