Protracted-blast electric circuit-breaker for alternating currents
CA 1047585 A · Owner: Gratzmuller, Jean L. · Inventors: Gratzmuller, Jean L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric circuit-breaker in which the arc extinction chamber is filled with liquefied SF6 under pressure. The moving contact of the circuit-breaker cooperates with a blast-piston which, during opening of the breaker and after the moving contact has reached its ultimate open position continues its travel in order to produce an intensive and protracted circulation of liquid dielectric from the arc extinction chamber in the region where the arc strikes across the contacts. Applications to ultra-high-speed breaking of high-tension high-intensity alternating 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
- Granted January 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 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.