Multi-stage heat sensing cable and emergency communications system
CA 1097710 A · Owner: Davies, John S. · Inventors: Davies, John S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat sensing cable is provided for use in an alarm and/ or fire extinguishing system, which is capable of responding to the presence of fire, or excessive heat and to sound an alarm, actuate fire extinguishing sprinkling equipment operate other fire, extinguishing means or to perform other emergency functions. The heat sensing cable of the invention comprises two or more multistrand single conductor plastic coated insulated wires twisted together in a spiral manner, and which are placed under tension when in use. Each insulated wire in the multi-conductor heat sensing cable of the invention consists of a single multi-strand conductor of low electrical resistance, formed of copper or other …
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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 March 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 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.