High-voltage circuit breaker with gas insulation and pneumatic operating mechanism
CA 2044447 C · Owner: Lissandrin, Mario · Inventors: Lissandrin, Mario
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high-voltage circuit breaker is housed in a first compartment (20) with SF6 under pressure and comprises an operating mechanism (30) with a pneumatic jack (46) actuated by the gas contained in the first compartment (20) via closing and opening valves (54, 60). The jack (46) is located in a sealed enclosure (34) bounding a second compartment (32) at low pressure playing the role of expansion volume of the gas expelled from the jack (46) at the end of travel of the piston (48). The gas pressure in the jack is controled by means of a control device (98) sensitive to the temperature variation of the gas under pressure in the first compartment (20).
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 June 12, 1991 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 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.