Insulated electrical conductors
CA 2026472 C · Owner: Burns, Norman Marshall · Inventors: Kharazi, Asghar; Burns, Norman Marshall
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vulcanizable semiconductive insulation shielding composition consisting essentially of based on the total weight of said composition (A), about 40 to 65 weight percent of an ethylene-vinyl acetate copolymer containing from about 27 to 45 weight percent of vinyl acetate based on the total weight of said copolymer, (B) about 5 to about 30 weight percent of a acrylonitrile butadiene copolymer containing from about 25 to about 55 percent by weight of acrylonitrile based on the total weight of said copolymer, (C) about 25 to about 45 weight percent of carbon black having a surface area of 30 to 60 meters 2 per gram and (D) about 0.2 to about 5 weight percent of an organic peroxide crosslinking …
Read the whole patent
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 September 28, 1990 and granted October 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2012.
- 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.