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Class Information
Number: 175/235
Name: Boring or penetrating the earth > With means movable relative to tool below ground to stop flow toward bore bottom > With longitudinally spaced valve seats > Seat engaged to stop upward flow
Description: Apparatus in which a surface or seat is engaged to stop the flow of material away from the bore bottom.

Patents under this class:

Patent Number Title Of Patent Date Issued
8408337 Downhole blowout preventor Apr. 2, 2013
8256538 Containment system for oil field riser pipes Sep. 4, 2012
6962215 Underbalanced well completion Nov. 8, 2005
6564885 Up-hole overshot and safety drilling apparatus May. 20, 2003
6408957 Sealed bearing roller cone bit having anti-plugging device Jun. 25, 2002
6145603 Extension drilling system Nov. 14, 2000
4664205 Hydraulic inner barrel in a drill string coring tool May. 12, 1987
4213508 Downhole fire control Jul. 22, 1980

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