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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:
1 2

Patent Number Title Of Patent Date Issued
5119891 Adaptor for drilling strings with controllable air passage Jun. 9, 1992
5058684 Drill pipe bridge plug Oct. 22, 1991
5020611 Check valve sub Jun. 4, 1991
5012876 Rotary drill bit providing separation of liquid from gas May. 7, 1991
4991669 Device for controlling the passage of a flushing medium in impact machines Feb. 12, 1991
4907660 Interchangeable sectional mining drill and bolt driver system Mar. 13, 1990
4823890 Reverse circulation bit apparatus Apr. 25, 1989
4700924 Pressure energized rotary hydraulic seal Oct. 20, 1987
4682661 Drilling apparatus Jul. 28, 1987
4660596 Inside B.O.P. valve Apr. 28, 1987
4457384 Water separator and backflow valve Jul. 3, 1984
4456217 Kelly valving apparatus Jun. 26, 1984
4407362 Flow control apparatus for wells Oct. 4, 1983
4403628 Inside blowout preventer Sep. 13, 1983
4393940 Retrievable float valve assembly Jul. 19, 1983
4391328 Drill string safety valve Jul. 5, 1983
4378847 Valve Apr. 5, 1983
4378842 Valve Apr. 5, 1983
4372402 Combination fluid nozzle and backflow valve Feb. 8, 1983
4303100 Kelly valve Dec. 1, 1981
4286659 Ball valve safety screen Sep. 1, 1981
4220176 Methods and apparatus for controlling fluid flow Sep. 2, 1980
4184554 Check valve for rock drill Jan. 22, 1980
4169510 Drilling and belling apparatus Oct. 2, 1979
4154313 Flow control valve for rock bits May. 15, 1979
4088298 Check valve assembly May. 9, 1978
4074761 Drilling tool Feb. 21, 1978
4072166 Valve apparatus for deep drilling Feb. 7, 1978
RE29471 Oil well testing apparatus Nov. 15, 1977
3968847 Wellpoint jetting head Jul. 13, 1976
3958648 Drilling equipment May. 25, 1976
3934659 Apparatus for drilling holes in earth surface Jan. 27, 1976

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