Heating system for electrically conductive elements of structures
CA 2177698 C · Owner: Granborg, Bertil S. M. · Inventors: Granborg, Bertil S. M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Low voltage, high current electrical, energy is supplied in a closed conductive loop. Preferably, the current is induced into the loop by a transformer (30A). The loop has at least in part, one, or a series of, conductive elements (24A, 22A, 16A 18A, 14A) of a structure to be warmed, The amount of current is sufficient in relation to the inherent resistivity of the elements (24A, 22A, 16A, 18A, 14A) to, cause the generation of heat within the elements. Preferably the current is an alternating current to travel at or near the skin of the elements in order to increase the effective resistivity of the elements and thereby increase the generation of heat therein, primarily around the skin of …
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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 29, 1993 and granted August 14, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2015.
- 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.