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Class Information
Number: 175/237
Name: Boring or penetrating the earth > With means movable relative to tool below ground to stop flow toward bore bottom > Means comprises dropped element
Description: Apparatus in which the movable means comprises an element which is described as being released in the tool shaft after said shaft is in the borehole to travel through a portion of said shaft to flow stopping position.

Patents under this class:

Patent Number Title Of Patent Date Issued
8297365 Drilling string back off sub apparatus and method for making and using same Oct. 30, 2012
7665545 Pressure controlled downhole operations Feb. 23, 2010
7347289 Dart-operated big bore by-pass valve Mar. 25, 2008
6820697 Downhole bypass valve Nov. 23, 2004
6540033 Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations Apr. 1, 2003
6315053 Method of use and apparatus for a hydraulic tensioning device for inflatable packer element Nov. 13, 2001
6253861 Circulation tool Jul. 3, 2001
4877095 Stopper for cable passages or conduits Oct. 31, 1989
4645006 Annulus access valve system Feb. 24, 1987
4452322 Drilling device for drilling a core in deep drill holes Jun. 5, 1984
4401171 Underreamer with debris flushing flow path Aug. 30, 1983
4378050 Arrangement for full hole drilling Mar. 29, 1983
4296822 Multipurpose fluid flow assisted downhole tool Oct. 27, 1981
4284149 Well drilling tool Aug. 18, 1981
4241797 Impact tool for dislodging stuck drill bits Dec. 30, 1980
4230192 Core sampling apparatus and method Oct. 28, 1980
4114704 Down hole well drilling tool with reversible thrust bearings Sep. 19, 1978
4114703 Well drilling tool having sealed lubrication system Sep. 19, 1978
4114702 Well drilling tool with lubricant level indicator Sep. 19, 1978
4059155 Junk basket and method of removing foreign material from a well Nov. 22, 1977
4058163 Selectively actuated vibrating apparatus connected with well bore member Nov. 15, 1977

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