Electrical switching apparatus including glowing contact protection
CA 2434294 C · Owner: Engel, Joseph C. · Inventors: Engel, Joseph C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical switching device, such as a receptacle includes a line circuit having a first temperature a neutral circuit having a second temperature and a load terminal. Separable contacts are adapted to electrically connect the line circuit and the load terminal. An operating mechanism opens the separable contacts in response to a trip signal. A first diode temperature sensor outputs a first signal representative of the first temperature of the line circuit. A second diode temperature sensor outputs a second signal representative of the second temperature of the neutral circuit. A difference circuit determines a difference between the first and second signals. A trip circuit provides the …
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
- Filed July 4, 2003 and granted March 13, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2025.
- 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.