Ball valve
CA 2045133 C · Owner: Den Norske Stats Oljeselskap A.S. · Inventors: Horvei, Knut V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a ball valve of the type comprising a ball member provided with two axially displaceable sleeves adapted to be displaced outwards to sealing engagement against seats provided in the surrounding valve housing in the open position of the valve so as to, form a flow passage through the valve and which comprises a, hollow drive axle for the rotary movement of the ball member between the open and a closed position and a drive spindle, through the hollow drive axle adapted to bringing about the axial displacement movement of the sleeves. On the drive spindle and for rotation together with it there are provided two preferably disc-shaped, first cam members on either side …
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 January 12, 1990 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2012.
- 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.