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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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Class Information
Number: 175/242
Name: Boring or penetrating the earth > With means movable relative to tool below ground to stop flow toward bore bottom > Stops flow by movement about fixed pivot > Pivot transverse to tool axis
Description: Apparatus in which the pivot point comprises an axis which is substantially transverse to the axis along which the tool is forming a bore.










Patents under this class:

Patent Number Title Of Patent Date Issued
7624821 Constricting flow diverter Dec. 1, 2009
4688648 Method of and apparatus for crushing earth under the ground Aug. 25, 1987
4627180 Excavating bucket Dec. 9, 1986
4413958 Apparatus for installation in wells Nov. 8, 1983
4367794 Acoustically actuated downhole blowout preventer Jan. 11, 1983
4296823 Cable tool with circulating drill stem Oct. 27, 1981
4291722 Drill string safety and kill valve Sep. 29, 1981
4262693 Kelly valve Apr. 21, 1981
4256192 Pressure core barrel Mar. 17, 1981
4230192 Core sampling apparatus and method Oct. 28, 1980
4228862 Apparatus for drilling holes in the ground Oct. 21, 1980
3997010 Downhole forward and back scuttling tool Dec. 14, 1976
3965999 Drilling grab for pile foundations and well boreholes Jun. 29, 1976
3938589 Drilling tool Feb. 17, 1976











 
 
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