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Class Information
Number: 175/243
Name: Boring or penetrating the earth > With means movable relative to tool below ground to stop flow toward bore bottom > Resiliently biased or composed of flexible material
Description: Apparatus in which (1) the movable means is held in a position by a resilient means such as spring or (2) the movable means is composed for flexible material such as rubber (e.g., flap valve).










Patents under this class:

Patent Number Title Of Patent Date Issued
8579047 Downhole reservoir effluent column pressure restraining apparatus and methods Nov. 12, 2013
8393403 Drill string flow control valves and methods Mar. 12, 2013
8353355 Drill string/annulus sealing with swellable materials Jan. 15, 2013
8066079 Drill string flow control valves and methods Nov. 29, 2011
7584801 Drill string flow control valves and methods Sep. 8, 2009
6585048 Wellbore system having non-return valve Jul. 1, 2003
6053261 Flow pulsing method and apparatus for the increase of the rate of drilling Apr. 25, 2000
5979572 Flow control tool Nov. 9, 1999
5404953 Blow-out prevention device for shutting off an annulus between a drill column and a well wall when drilling for oil or gas Apr. 11, 1995
5230390 Self-contained closure mechanism for a core barrel inner tube assembly Jul. 27, 1993
5119891 Adaptor for drilling strings with controllable air passage Jun. 9, 1992
5020612 Wire line core drilling apparatus Jun. 4, 1991
4979577 Flow pulsing apparatus and method for down-hole drilling equipment Dec. 25, 1990
4832138 Device to control the locking of a boring corer May. 23, 1989
4452321 Device in core barrels Jun. 5, 1984
4406335 Special circulation sub Sep. 27, 1983
4331207 Device for reversing the direction of flow of a fluid at the level of a drill bit May. 25, 1982
4298077 Circulation valve for in-hole motors Nov. 3, 1981
4258803 Core barrel for obtaining and retrieving subterranean formation samples Mar. 31, 1981
4142594 Method and core barrel apparatus for obtaining and retrieving subterranean formation samples Mar. 6, 1979
4057118 Bit packer for dual tube drilling Nov. 8, 1977
3997009 Well drilling apparatus Dec. 14, 1976
3978932 Apparatus and method for obtaining undisturbed soil core samples Sep. 7, 1976
3949819 Soil sampling device Apr. 13, 1976











 
 
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