Method for the preparation of a microporous diaphragm
CA 2136763 A1 · Owner: Rhone-Poulenc Chimie · Inventors: Magne, Jean-Claude; Kuntzburger, Frederic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Diaphragm for use in cells for the electrolysis of alkaline halide solutions comprising: 100 parts by weight of asbestos fibres 30 to 70 parts by weight of silica-based derivatives and 20 to 60 parts by weight of fluorinated polymers deposited on a porous material. The weight ratio of the fluorinated polymers and the silica-based derivatives is between 0.6 to 1.2 and preferably between 0.6 to 0.9 with the exception of a diaphragm obtained by depositing a suspension comprising 100 parts by dry weight of asbestos fibres 30 parts by dry weight of silica-based derivatives 25 parts by dry weight of fluorinated polymers and 1.5 parts by dry weight of a thickening agent. The invention also …
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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 March 28, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.