Mud retaining valve
CA 1072944 A · Owner: American International Tool Company · Inventors: Parker, Bill G.; Begnaud, Rudy; Cormier, Arthur J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve adapted for insertion in a radially enlarged portion of the kelly saver sub to retain mud in the kelly when the drill pipe is disconnected therefrom including a, tubular body with a downwardly extending closure member supported thereby, and a piston having an axial passage for the flow of drilling mud therethrough, axially movable within the body. The plug may be removed from the bore by the application of an upwardly directed tension force thereto so that wire, line tools may be run through the bore and the passage.
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
- Granted March 4, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 4, 1997.
- 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.