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Class Information
Number: 175/218
Name: Boring or penetrating the earth > With above-ground means for handling drilling fluid or cutting > With valve
Description: Apparatus including valve means to stop or regulate the flow of drilling fluid.










Patents under this class:
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Patent Number Title Of Patent Date Issued
6390190 Tubular filling system May. 21, 2002
6315051 Continuous circulation drilling method Nov. 13, 2001
6053191 Mud-saver valve Apr. 25, 2000
6003622 Drill tube for use in upward rock drilling Dec. 21, 1999
5887667 Method and means for drilling an earthen hole Mar. 30, 1999
5836395 Valve for wellbore use Nov. 17, 1998
5813483 Safety device for use on drilling rigs and process of running large diameter pipe into a well Sep. 29, 1998
5775442 Recovery of gas from drilling fluid returns in underbalanced drilling Jul. 7, 1998
5507467 Actuator for a drill string internal blowout preventer Apr. 16, 1996
5497839 Liquid-driven downhole hammer drill Mar. 12, 1996
5165493 Mud saver valve Nov. 24, 1992
5020610 Removable filter fluid flow shutoff apparatus Jun. 4, 1991
5012854 Pressure release valve for a subsea blowout preventer May. 7, 1991
4991669 Device for controlling the passage of a flushing medium in impact machines Feb. 12, 1991
4962819 Mud saver valve with replaceable inner sleeve Oct. 16, 1990
4899837 Mud saver valve Feb. 13, 1990
4832126 Diverter system and blowout preventer May. 23, 1989
4795128 Gate type kelly cock valve Jan. 3, 1989
4779688 Mud saver valve Oct. 25, 1988
4665944 On-off dump valve May. 19, 1987
4655302 Rotating coupling Apr. 7, 1987
4650153 Oil well safety valve for use with drill pipe Mar. 17, 1987
4577700 Method and system for displacing drilling fluid from a drill string in a well drilling system Mar. 25, 1986
4577614 Advanced quick ball release sub Mar. 25, 1986
4535851 Fluid flow measurement system Aug. 20, 1985
4535852 Drill string valve actuator Aug. 20, 1985
4478244 Mud saver valve Oct. 23, 1984
4470430 Drilling choke Sep. 11, 1984
4448267 Door drilling Kelly May. 15, 1984
4440243 Drill cuttings conveying head with wet cuttings diverter Apr. 3, 1984
4437525 Hand held water drilling apparatus Mar. 20, 1984
4417600 Safety valve Nov. 29, 1983
4413688 Diverter valve Nov. 8, 1983
4377177 Throttling mud choke apparatus Mar. 22, 1983
4371045 Method and apparatus for recovering unstable cores Feb. 1, 1983
4364407 Mud saver valve Dec. 21, 1982
4323221 Power actuated valve Apr. 6, 1982
4316596 Power actuated valve Feb. 23, 1982
4315553 Continuous circulation apparatus for air drilling well bore operations Feb. 16, 1982
4303100 Kelly valve Dec. 1, 1981
4254836 Methods and apparatus for controlling fluid flow Mar. 10, 1981
4253530 Method and system for circulating a gas bubble from a well Mar. 3, 1981
4245672 Sealing valve for sludge scavenging system Jan. 20, 1981
4168753 Tool for introducing self-tapping dowels Sep. 25, 1979
4064952 Device attachable to power drills for removal of material released during drilling Dec. 27, 1977
4044834 Apparatus and method for controlling the flow of fluids from a well bore Aug. 30, 1977
3967679 Mud saver valve Jul. 6, 1976
3965980 Mud saver valve Jun. 29, 1976
3941348 Safety valve Mar. 2, 1976

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