Plug valve
CA 2254530 A1 · Owner: Cicero, Charles Lo · Inventors: Cicero, Charles Lo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plug valve having a tapered plug that seats in a first flow passage in a valve body is disclosed. The plug defines a second flow passage cooperating with the first flow passage so that by rotating the plug through 90° the plug valve is fully open or fully closed. The plug valve is opened by rotating the plug in a counterclockwise direction which also lifts the plug in an axial direction away from the valve seats. When the plug valve is rotated in a clockwise direction, the plug is rotated and moves in a downward axial direction into engagement with the valve seats. A resilient biasing member is provided between the valve seats and the valve body to continuously bias the valve seats into …
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 November 26, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2020.
- 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.