Apparatus and method for removing fluids from underground wells
CA 2254722 C · Owner: Amani, Mohammad · Inventors: Amani, Mohammad
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for supplying and venting gas to a downhole accumulation chamber (34) that includes a supply valve (70) having an open supply position to supply gas to the chamber (34) and a closed supply position a vent valve (90) , having an open vent position to vent gas from the chamber (34) and a closed position, and an actuator (109) communicating with a source of pressurized fluid (24) at the surface for actuating the supply (70) and vent (90) valves. The actuator (109) moves the supply valve (70) to the open position and the vent valve (90) to the closed position and alternately moves the vent valve , (90) to the open vent position and the supply valve (70) to the closed supply …
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 26, 1997 and granted December 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2019.
- 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.