Polyether-moulding material, process for its preparation and its use
CA 2002807 C · Owner: Jochum, Peter · Inventors: Gasser, Oswald; Guggenberger, Rainer; Jochum, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyether-impression material comprising components (a) a polyether, which has at least two optionally substituted vinyl- and/or allyl-end groups, (b) an SiH component (c) a platinum catalyst, and optionally (d) the usual additives, characterized in that the SiH-component (b) can be obtained by the reaction of an at least bi-functional allyl- or vinyl-hydrocarnon compound the hydrocarbon radical of which, without taking account of the allyl- or vinyl-groups and the optionally present alkylene ether groups, has 6 to 30 C-atoms and contains at least one aromatically unsaturated, heterocyclic, or cycloaliphatic ring with at least, one mole per vinyl- or allyl-group of an at least …
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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 November 10, 1989 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2011.
- 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.