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Class Information
Number: 175/318
Name: Boring or penetrating the earth > With means movable relative to tool or shaft to control below-ground passage > Valve prevents upward flow
Description: Apparatus in which the means comprises a subsurface valve so mounted in the tool or tool shaft as to prevent the upward flow of fluent material in the tool or tool shaft.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8678110 Mud saver valve and method of operation of same Mar. 25, 2014
8534369 Drill string flow control valve and methods of use Sep. 17, 2013
8408337 Downhole blowout preventor Apr. 2, 2013
8393403 Drill string flow control valves and methods Mar. 12, 2013
8118104 Downhole valve with pass through ID Feb. 21, 2012
8104505 Two-way actuator and method Jan. 31, 2012
8069926 Method of controlling flow through a drill string using a valve positioned therein Dec. 6, 2011
8066079 Drill string flow control valves and methods Nov. 29, 2011
7967082 Downhole mechanism Jun. 28, 2011
7913772 Drilling fluid flow diverter Mar. 29, 2011
7845433 Device and procedure for the insertion of a new drilling string-element into the drill-string of a well Dec. 7, 2010
7779934 Flexible/rigid drilling assembly Aug. 24, 2010
7762353 Downhole valve mechanism Jul. 27, 2010
7726418 Method and apparatus for adding a tubular to drill string with diverter Jun. 1, 2010
7686076 Expandable tubulars for use in a wellbore Mar. 30, 2010
7604063 Flow valve and method Oct. 20, 2009
7584801 Drill string flow control valves and methods Sep. 8, 2009
7281592 Injecting a fluid into a borehole ahead of the bit Oct. 16, 2007
7204327 Reverse circulation directional and horizontal drilling using concentric drill string Apr. 17, 2007
7165634 Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells Jan. 23, 2007
7140455 Valve method for drilling with casing using pressurized drilling fluid Nov. 28, 2006
7108080 Method and apparatus for drilling a borehole with a borehole liner Sep. 19, 2006
7100710 Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells Sep. 5, 2006
7090033 Drill string shutoff valve Aug. 15, 2006
7017671 Mud saver valve Mar. 28, 2006
7017682 Drill string shutoff valve Mar. 28, 2006
7013997 Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells Mar. 21, 2006
6962215 Underbalanced well completion Nov. 8, 2005
6918452 Drill string shutoff valve Jul. 19, 2005
6732819 Mudsaver valve with retrievable inner sleeve May. 11, 2004
6732804 Dynamic mudcap drilling and well control system May. 11, 2004
6520271 Fluid powered rotary drilling assembly Feb. 18, 2003
6408957 Sealed bearing roller cone bit having anti-plugging device Jun. 25, 2002
6318482 Blowout preventer Nov. 20, 2001
6289999 Fluid flow control devices and methods for selective actuation of valves and hydraulic drilling tools Sep. 18, 2001
6263987 One pass drilling and completion of extended reach lateral wellbores with drill bit attached to drill string to produce hydrocarbons from offshore platforms Jul. 24, 2001
6250383 Lubricator for underbalanced drilling Jun. 26, 2001
6241032 One-way drill string clutch Jun. 5, 2001
6216799 Subsea pumping system and method for deepwater drilling Apr. 17, 2001
6209663 Underbalanced drill string deployment valve method and apparatus Apr. 3, 2001
6167974 Method of underbalanced drilling Jan. 2, 2001
6158531 One pass drilling and completion of wellbores with drill bit attached to drill string to make cased wellbores to produce hydrocarbons Dec. 12, 2000
6152232 Underbalanced well completion Nov. 28, 2000
5979572 Flow control tool Nov. 9, 1999
5894897 Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells Apr. 20, 1999
5860478 Sub-sea test tree apparatus Jan. 19, 1999
5794729 Coker unit drilling equipment Aug. 18, 1998
5645132 Drill bit having springless check valve and method of blocking backflow during drilling Jul. 8, 1997
5310005 Flapper valve assembly with floating hinge May. 10, 1994
5145005 Casing shut-in valve system Sep. 8, 1992

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