Filtering apparatus for synthetic thermoplastics material
CA 2085487 C · Owner: Wendelin, Georg · Inventors: Schulz, Helmuth; Wendelin, Gerhard; Bacher, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a filter for thermoplastic material with a housing (I), in which a support element (4) in the shape of a piston, for two nests of screens (8 9) is mounted for longitudinal motion along its axis. In the filtration position the, melt flows out of a feed channel (2) and through inlet channels (10-13) into distributor spaces (14, 15) located in front of the nests of screens (8 or 9) then through the, screens and through outlet channels (18 19) into a discharge channel (3). Each distributor space (14, 15) is sub-divided into sections by at least one wall (21) one inlet, channel (10-13) opening out into each such section. By displacing the support element (4) …
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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 July 11, 1991 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2013.
- 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.