Heating device for utilizing the skin effect of alternating current
CA 1192247 A · Owner: Ricwil, Incorporated · Inventors: Parman, David G.; Weitzel, Harold B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heating Device for Utilizing the, Skin Effect of Alternating Current ABSTRACT, An improved power cable for a heating system that utilizes the skin effect of alternating current and a, method and apparatus for joining lengths of the improved cable. In one embodiment, the cable includes a stranded copper conductor (20) surrounded by a semiconductive layer (22) formed by carbonized tetrafluoroethylene (TFE) tape which is surrounded by a primary insulation layer (24) formed by pressure extruded perfluoroalkoxy, resin (PFA), the thickness of which is determined by an equation that considers the eccentric positioning of the power cable in a heat tube (14). In a second embodiment, the cable …
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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 August 20, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2002.
- 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.