Rubbers swellable with water and aqueous solutions and the method for producing the same
CA 2017349 C · Owner: Lopour, Petr · Inventors: Vondracek, Petr; Lopour, Petr; Sulc, Jiri
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The solution concerns rubbers swellabie with water and water solutions and the method of their production. The substance of solution are rubbers swellable with water or aqueous solutions consisting of a rubber matrix based on, rubbers which can be vulcanized at temperature up to 150°C and, a hydrogel filler, where the content of filler amounts to 20 to 120 weight parts per 100 weight parts of rubber and where suitable rubbers are natural rubber, butadiene-styrene rubber acrylonitrile-butadiene rubber, bromobutyl rubber or ethylene-, propylene rubber. The rubbers according to the solutions are produced in such a way, that the powdery filler is blended into a non-crosslinked rubber which is …
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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 May 23, 1990 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.