Method and apparatus for cooling hollow molded product
CA 2210962 C · Owner: Lupke, Manfred A. A. · Inventors: Lupke, Manfred A. A.; Lupke, Stefan A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of forming a hollow product in a molding apparatus having an upstream and a downstream end comprises extruding a parison of thermoplastic material in a molten state from a heated extruder at the upstream end and moving the material through a product shaping region towards the downstream end of the apparatus. The material is cooled by passing a cooling medium internally of the product from the downstream end towards the upstream end of the apparatus.
Read the whole patent
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 January 25, 1996 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2018.
- 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.