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Class Information
Number: 175/234
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
Description: Apparatus in which at least two surfaces are spaced along the bore axis, said surfaces being adapted to cooperate with relatively movable flow stopping means.

Sub-classes under this class:

Class Number Class Name Patents
175/235 Seat engaged to stop upward flow 8

Patents under this class:

Patent Number Title Of Patent Date Issued
8612398 Clean store for operating system and software recovery Dec. 17, 2013
7108080 Method and apparatus for drilling a borehole with a borehole liner Sep. 19, 2006
7017682 Drill string shutoff valve Mar. 28, 2006
6543532 Electrical surface activated downhole circulating sub Apr. 8, 2003
6349763 Electrical surface activated downhole circulating sub Feb. 26, 2002
6089335 Positive latch core barrel apparatus Jul. 18, 2000
6053261 Flow pulsing method and apparatus for the increase of the rate of drilling Apr. 25, 2000
6029758 Retractable core barrel valving apparatus Feb. 29, 2000
6019181 Core drilling latch assembly Feb. 1, 2000
5165492 Apparatus for preventing separation of a down-hole motor from a drill string Nov. 24, 1992
5141062 Tool actuator Aug. 25, 1992
5095976 Tubing sand pump Mar. 17, 1992
5020612 Wire line core drilling apparatus Jun. 4, 1991
4958690 Drilling device with hydraulic percussion generator for earth drilling purposes Sep. 25, 1990
4928775 Downhole surge valve for earth boring apparatus May. 29, 1990
4924940 Downhole cleanout tool May. 15, 1990
4645006 Annulus access valve system Feb. 24, 1987
4493383 Well clean out tool Jan. 15, 1985
4317490 Apparatus and method for obtaining a core at in situ pressure Mar. 2, 1982
4296823 Cable tool with circulating drill stem Oct. 27, 1981
4252209 Downhole liquid pressure seismic source and bit positioning system Feb. 24, 1981
4019592 By-pass tool Apr. 26, 1977
3997009 Well drilling apparatus Dec. 14, 1976

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