Device for cooling, granulating and drying molten strands of synthetic thermoplastic material emerging from dies
CA 2102922 C · Owner: Hunke, Friedrich · Inventors: Hunke, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a device for cooling, granulating and drying molten strands of synthetic thermoplastic material emerging from dies. It comprises a cooling unit which feeds the strands into a bath of cooling liquid and to which is connected a granulator housing with a cutting roll, the latter being connected to an outlet duct with a sieve to separate the thermoplastic material from the cooling liquid. The sieve is arranged in such a way that the grains separated from the strands by the cutting roll impinge directly on the sieve at basically the same speed as that imparted to the grains by the cutting roll.
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 March 16, 1993 and granted November 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2015.
- 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.