Method of densifying a porous substrate by means of a matrix containing carbon
CA 2059471 C · Owner: Brosse, Christian R. · Inventors: Cavalier, Jean-Claude; Brosse, Christian R.; Bernard, Bruno C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of densifying a porous substrate by means of a matrix containing carbon, for obtaining an article made of a composite material the, method comprising the following steps: providing on one side of a substrate to be densified a suspension containing submicron carbon powder;, establishing a pressure difference to force the suspension through the substrate;, filtering the liquid that has passed through the substrate to retain the carbon powder inside the substrate; and when densification of the substrate by means of the carbon powder has terminated, drying the densified substrate and transforming a carbon precursor introduced into the substrate into carbon by carbonization thereby …
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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 January 16, 1992 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2014.
- 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.