Method of obtaining membrane-type separators
CA 1114276 A · Owner: Z L E H I T Pri Ban · Inventors: Moshtev, Rafail V.; Budevska, Hrisanta N.; Ivanova, Latinka T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method for the production of membrane battery separators by grafting a vinyl monomer to a polyolefin film activated, by ultraviolet irradiation, and heating the film. The grafting is effected in a five-layer sandwich which comprises the activated polyolefin film, covered from both sides with cellulose material, impregnated with the monomer or its solution and pressed from each side by an inert polymer band enclosing the reaction space. The sandwich is then pressed from 10 to 45 minutes against a heater with a pressure towards the surface of the heating element of from 10 to 30 g/cm2, the layers of the sandwich being bands endless in length, the sandwich …
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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 December 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 1998.
- 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.