Method for altering cable semiconductive layer
CA 2261030 C · Owner: Mooney, Justine Anne · Inventors: Mooney, Justine Anne; Shreve, Gary A.; Guilbert, Curtis Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of altering a portion of the semiconductive layer of an electric power cable, to increase its resistance so as to render it electrically insulative. The semiconductive layer is loaded with carbon powder which forms chains to provide conductive pathways through the layer. By introducing an intercalant into the semiconductive layer which causes the layer to swell, the conductive pathways are interrupted and the material is rendered insulative ( > 104 .OMEGA.-cm). The intercalant may be a polymerizable material with a curing agent which is cured in situ i.e. without removing , the semiconductive layer from the cable. By this method flashover to the , semiconductive layer at a …
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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 November 21, 1996 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2018.
- 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.