Fluid economizer control valve system for blowout preventers
CA 2038407 A1 · Owner: Baroid Technology, Inc. · Inventors: Khan, Farooq A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
the Disclosure, A flow pressure sensing control valve system is disclosed for use with blowout preventers having an operator cylinder and piston for closing of the blowout preventer wherein the operator cylinder and piston have a closing side and an opening side and wherein the closing side has a greater effective surface area than the opening side. The system includes a sensing means for dropping pressure of flow directed to the closing side relatively with increases In the flow velocity of the fluid flow. A fluid return system is included for selectively directing the fluid from the opening side of the operator piston to the closing side of the operator piston when the drop in pressure …
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 March 15, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 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.