A method for the integral moulding of a synthetic thermoplastics part and an apparatus for carrying out the method
CA 2018846 C · Owner: Tetra Pak Holdings And Finance S.A. · Inventors: Andersson, Par
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for the integral moulding of a thermoplastics top on the edge of a cardboard tube, the plasticised synthetic plastics material being injected into the mould cavity (16) formed by inner (7) and outer mould parts (8, 8'), the mould parts (7 8, 8') being pressed against each other with force. In order to be able to produce relatively thin plastics parts with a high degree of dimensional accuracy in the very shortest time and by using simpler tools it is, suggested that the mould cavity (16) in a first stage be maintained at a large volume during which the plasticised synthetic plastics material at least partially (20) fills the mould cavity (16) under a relatively low …
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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
- Filed June 12, 1990 and granted April 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.