Electrically insulating material comprising stretched polypropylene filmhaving improved electrical characteristics
CA 1290536 C · Owner: Sumitomo Chemical Company, Limited · Inventors: Ima, Seiichiro; Miyatake, Tatsuya; Wakamatsu, Kazuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrically insulating material comprising a stretched polypropylene film is disclosed the stretched, film being obtained by at least uniaxially stretching a polypropylene composition containing from 0.05 to 10,000 ppm by weight of a polymer of a 3-branched .alpha.-olefin having 6 or more carbon atoms and/or a vinylcycloalkane having 6 or more carbon atoms in terms of a monomer unit thereof. The electrically insulating material has a high dielectric breakdown voltage and is suitable for producing smallsized condensers.
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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 October 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2008.
- 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.