Method and an apparatus for the production of pipes
CA 1297649 C · Owner: Sillanpaa, Pauli · Inventors: Sillanpaa, Pauli; Jarvenkyla, Jyri
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a method and an apparatus for the production of pipes. In the extrusion of plastic pipes, a circular mould cavity is formed of chill moulds (1, 2) which are semicircular in cross-section and the junction faces of which are pressed against each other. In order to keep the chill moulds tightly against each other, it is known to provide the edge area of the chill moulds (1, 2) with counter pieces (4) which have locking surfaces (5) whereon a press force is exerted by means of a rail of a U-shaped cross-section. In this known solution, great friction forces are created between the locking surface (53 and the rail, and the diameter of the mould increases in a direction …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.