Self-sourcing, isolated zone selective interlocking system for use with electronic trip circuit breakers
CA 2295888 C · Owner: Dunne, David J. · Inventors: Haun, Andy A.; Dunne, David J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A zone selective interlocking system for electronic trip circuit breakers includes a plurality of downstream terminals each downstream terminal , connecting with at least one of a plurality of downstream electronic trip circuit breakers having input terminals. A restraint input circuit module including a voltage comparator, is connected to the input terminals of each of the downstream electronic trip circuit breakers and the input terminals are shorted together providing a self-restraint signal for each downstream electronic trip circuit breaker at the occurrence of a downstream fault condition. The system also includes a plurality of upstream terminals each , upstream terminal …
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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 May 5, 1999 and granted May 31, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2021.
- 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.