Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
David B. Mason0
Lawrence Wells0
Padmasiri Daya Seneviratne0
Date of Patent
October 30, 2007
0Patent Application Number
112010560
Date Filed
August 9, 2005
0Patent Primary Examiner
Patent abstract
A triple-valve internal blow out preventer having unitary construction is provided, each valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein the central opening may include an undercut. A protective coating may also be applied to both the external surface and the undercut of the ball to increase the durability of each of the valves.
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