Gas lift valve with central body venturi for controlling the flow of injection gas in oil wells producing by continuous gas lift
CA 2435580 C · Owner: Resende De Almeida, Alcino · Inventors: Resende De Almeida, Alcino
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a gas lift valve (34) for use in an oil well producing by means of gas lift, said gas lift valve (34) making use of a central body venturi (40) for both controlling the flow of the injection gas from the annulus (6) between the tubing (3) and the casing (2) of the oil well, and precluding a reverse flow of fluids from said oil well towards said annulus(6).
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 17, 2002 and granted July 26, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2024.
- 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.