Self-regulating electrical heating device
CA 1207467 A · Owner: Bronnvall, Wolfgang · Inventors: Bronnvall, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A self-limiting electrical heating device with an electrical resistance material the resistivity of which is changed by more than a power of 10 within a predetermined narrow temperature, interval and which is arranged between electrical conductors connectible to a voltage source, the conductors and the resistance material being enclosed in an electrically insulating cover is described. The electrical resistance material (2) comprises 1) an electrically relatively non-conducting crystalline mono-, meric substance which melts within or near the predetermined narrow temperature interval and which constitutes the outer phase 2) particles of one or more electrically conducting material(s) …
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 July 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 8, 2003.
- 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.