Method of making porous plastic diaphragms and the resulting novel diaphragms
CA 1076065 A · Owner: Societe Rhone-Poulenc Industries · Inventors: Bachot, Jean; Juillard, Michel; Bouy, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for manufacturing novel electrolytic cell diaphragms which are consolidated by a fluorinated polymer resin. The method comprises agitating a suspension of asbestos fibers in water, a sulfonic anionic surfactant, a fluorinated polymer resin latex and a solid mineral pore-former, to form a stable homogeneous suspension, depositing and filtering the suspension on a grid or screen to produce a preform. The preform is dried, sintered at a temperature above the crystalline melting point of the fluorinated polymer resin and the, solid mineral pore-former is removed to form a uniform porous membrane, having uniform pore size. This membrane is combined with a reinforcing …
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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
- Granted April 22, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 22, 1997.
- 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
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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.