Device for processing thermoplastic materials
CA 2178197 C · Owner: Bacher, Helmut · Inventors: Schulz, Helmuth; Wendelin, Georg; Bacher, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for plasticising thermoplastic materials has a revolving feed screw for plasticising the plastic materials within a housing. The plastic materials to be plasticised are supplied to the feed screw by a feeding device through a feeding hole in the housing. The housing of the feed screw is provided on its inner wall with at least two broad pockets. These pockets extend in the longitudinal direction of the feed screw and are mutually separated by narrow ribs when compared to the width of the pocket. One pocket is open towards the feeding hole, the other pockets are sealed against the feeding hole by at least one rib of the housing of the feed screw. In order to improve filling of the …
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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 December 20, 1994 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2016.
- 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.