Effective arc stack/efficient contact carrier
CA 2051202 A1 · Owner: Square D. Company · Inventors: Oster, Clark L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit breaker (51) comprising an arc stack of metal plates (52) disposed parallel to the movement of the circuit breaker's contact arm (12) is disclosed. The metal plate (54) farthest from the contact arm (12) is electrically connected to the external lug (18) of the circuit breaker (51) to provide a physical and electrical shield against unintended lug strikes. The contact arm (12) is constructed to be of low mass, minimum conductivity and highly resistent to bending, thereby enabling faster contact separation and reduced arcing currents.
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 September 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2013.
- 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.