Oil well casing cementing receiver and plug
CA 2124404 C · Owner: Schlosser, Guy · Inventors: Schlosser, Guy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a receiver for use in an oil well during a cementing step, to receive a plug which seals off the cement from the interior of the well while the cement hardens. The receiver has a flow limiting flap which restricts the amount of drilling mud which can flow into the well casing while the casing is lowered into the well. The mating plug for the receiver has latches which engage the bottom of the receiver so that the plug cannot be dislodged upwardly.
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 May 26, 1994 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 2016.
- 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.