Silicone rubber composition for high voltage electrical insulators
CA 2047906 A1 · Owner: Kunieda, Shigehiko · Inventors: Nakai, Takao; Takeshita, Kazuhide; Matsushita, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A silicone rubber composition for high voltage electrical insulators capable of being converted to a rubbery elastomer superior in high voltage electrical insulating characteristics is provided. The composition comprises the following components (a) to (e) and not containing a platinum catalayst:, (a) 100 parts by weight of an organopolysiloxane gum represented by an average unit formula of RaSiO wherein, R is a monovalent hydrocarbon group of which at least, 50 mole% is alkyl, and a is a number of 1.98 to 2.02; (b) 10 - 100 parts by weight of a finely divided silica filler;, (c) 15 - 300 parts by weight of aluminum hydroxide; (d) 1 - 20 parts by weight of an organosilane or organosiloxane …
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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 July 25, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 2013.
- 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.