Heat-recoverable laminated heater with ptc layer operating above switching temperature
CA 1071281 A · Owner: Raychem Corporation · Inventors: Horsma, David A.; Whitney, Wells
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to electrical devices in which a PTC element is used to control the temperature of the device. In the devices of the invention, a PTC element is associated with a heatsupplying means which supplies a controlled amount of heat to at least part of the PTC element after it has reached its switching temperature. The devices are particularly useful when in the form of laminates, for example, heat-recoverable laminates which will recover when current is passed through them.
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 February 5, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 1997.
- 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.