Molded case circuit breaker operating handle guard
CA 2053609 A1 · Owner: Castonguay, Roger Neil · Inventors: Castonguay, Roger Neil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A molded case circuit breaker with a visual access slot next to the circuit breaker operating handle allows the conditions of the circuit breaker contacts to be visually ascertained. To prevent inadvertent displacement of the circuit breaker operating handle when the circuit breaker is connected within an electrical distribution circuit, a handle guard is positioned over the circuit breaker operating handle. The handle guard is arranged such that the circuit breaker operating handle is free to reciprocate between the ON, OFF and TRIPPED positions while the operating handle guard is in position.
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 October 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 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.