Heating cable and method of making same
CA 1258878 A · Owner: Chromalox, Inc. · Inventors: Cunningham, Donald M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heating cable includes a pair of spaced apart electrical conductors extending the length of the cable. A matrix of filled polymeric material in physical contact with the conductors forms a heat generating web therebetween. The filled polymeric material has a volume resistivity selected to provide a predetermined heat output per unit length of cable. A plurality of macroscopic perforations are punched through the web between the two conductors so that the actual heat output per unit length of cable is a desired value less than the predetermined heat output per unit length. An electrically insulative jacket longitudinally covers the conductors and the web.
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 August 29, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 29, 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.