Electrical heater
CA 1250616 A · Owner: Flexwatt Corporation · Inventors: Grise, Frederick G.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of Disclosure A sheet heater including a substrate, a semi-conductor pattern (typically of colloidal graphite) having a pair of spaced apart conductor contact portions and a heating portion extending between and electrically connected to the contact portions, and a pair of conductors one of which overlies and engages each of the contact portions. Each of the conductors is wider than the respective underlying contact portion of the semi-conductor pattern, and includes a pair of longitudinallyextending strip portions with a central portion including a plurality of longitudinally-spaced openings therebetween. The strip portion at one edge of the conductor overlies and engages 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
- Granted February 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2006.
- 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.