Choke valve for throttling fluid flow
CA 2274345 C · Owner: Cove, Harry Richard · Inventors: Bohaychuk, Larry J.; Cove, Harry Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a choke valve having a cage with external sleeve flow trim the large ports of the cage are aligned with the axis of the inlet bore and a deflection bar is positioned at the top end of the main bore opposite to the inlet bore. The flow patterns within the choke are consequently altered with significant reduction of localized erosional wear areas.
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 11, 1999 and granted December 31, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2021.
- 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.