Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
November 3, 2015
Patent Application Number
12639697
Date Filed
December 16, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
A valve on an inner string can only be closed with multiple movements in opposed directions that occur after a predetermined force is held for a finite time. Holding the force against resistance eventually allows movement that arms the valve. A set down and pickup force will then close the valve. The surrounding string has a constriction that interacts with a j-slot to rotate a wedge with a first peak into alignment with a peak on a second wedge that can only translate against a spring bias. The second wedge is eccentrically linked to a ball that rotates between and open and a closed position.
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