Temperature compensation circuit for an arc fault current interrupting circuit breaker
CA 2354679 C · Owner: Tilghman, Douglas B. · Inventors: Mason, Henry H. Jr.; Tilghman, Douglas B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arc fault current interrupting (AFCI) circuit breaker (10) includes a pair of electrical contacts (20 34) for stopping the flow of electrical current in a protected portion of the distribution circuit. A low pass filter (102) is configured to receive a signal indicative of a voltage across a resistance (106) in the distribution circuit. The low pass filter (102) amplifies the signal and provides the signal to an arc fault detection circuit. The low pass filter (102) includes an input resistance (106) and a feedback resistance (108). In one embodiment of the invention the input resistance (106) has a positive temperature coefficient. In another embodiment the feedback resistance (108) has …
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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
- Filed August 2, 2001 and granted March 25, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 2, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2023.
- 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
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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.