Valve
CA 2046322 A1 · 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
Valve apparatus in particular a rotatable valve comprising an upper part (10) and a lower part (6) which are demountably attached to each other. The valve's lower part (6) is mainly U-formed with sealing surfaces (17, 18) arranged on the outwardly facing side faces, which sealing surfaces, in the case of closed valve bear against at least one valve seat on the valve housing's inlet and/or outlet end, and upper part's (10) external face is designed for totally or partly supporting bearing against lower part's (6) internal face and comprising a passage (34) designed to accommodate equipment, for example controlling or metering instruments in the upper part (10) can, in the case of closed …
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 February 7, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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.