Semiconductive filling compound for power cable capable of withstanding lower temperatures
CA 1112731 A · Owner: Gk Technologies, Incorporated · Inventors: Thompson, Paul F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is an improved filling compound for preventing moisture penetration along the interior of high voltage electric power cables. Amorphous polypropylene mixed with carbon where it must be semiconductive is an, extremely good filling compound because of its electrical characteristics and also because of its good flow characteristics when extruding. When the cable is to be used under condition, where it must withstand temperatures so low that the poolypropylene becomes brittle, it can be blended with polyisobutylene rubber to withstand lower temperatures but, the blend must be kept within limits to prevent loss of the good flow characteristics of the amorphous polypropylene.
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
- Granted November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 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.