Trip circuit for an electric circuit breaker
CA 1066399 A · Owner: General Electric Company · Inventors: Wilson, Walter R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This trip circuit comprises a DC source and the series combination of a trip coil and a thyristor connected across the source. Connected between the source and the gate circuit of the thyristor is a triggering circuit including protective relay contacts that are operable to cause current from the source to flow through the triggering circuit and the gate circuit, thus firing the thyristor to produce effective energization of the trip coil. For producing effective energization of the trip coil in the event that the thyristor fails to fire, there is provided back-up connected externally of the thyristor between its gate circuit and its cathode for providing a conductive path in series with …
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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 November 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 13, 1996.
- 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.