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Class Information
Number: 175/267
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > Cutter element shifted by fluid pressure
Description: Apparatus in which the laterally movable cutter element is moved laterally by means of a fluid under pressure acting against the cutter element or a below ground part attached thereto.










Sub-classes under this class:

Class Number Class Name Patents
175/269 Fluid pressure acts against spring biased part 93
175/268 With dropped element 19


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
5242017 Cutter blades for rotary tubing tools Sep. 7, 1993
5201817 Downhole cutting tool Apr. 13, 1993
5197553 Drilling with casing and retrievable drill bit Mar. 30, 1993
5184687 Well reamer Feb. 9, 1993
5174374 Clean-out tool cutting blade Dec. 29, 1992
5141063 Restriction enhancement drill Aug. 25, 1992
5107943 Method and apparatus for gravel packing of wells Apr. 28, 1992
5103921 Coring assembly for mounting on the end of a drill string Apr. 14, 1992
5090480 Underreamer with simultaneously expandable cutter blades and method Feb. 25, 1992
5074366 Method and apparatus for horizontal drilling Dec. 24, 1991
5060738 Three-blade underreamer Oct. 29, 1991
5060736 Steerable tool underreaming system Oct. 29, 1991
5036921 Underreamer with sequentially expandable cutter blades Aug. 6, 1991
4976323 Counterboring device for wells Dec. 11, 1990
4971163 Drilling bucket apparatus for cast-in-place piles with expanded bottoms Nov. 20, 1990
4915181 Tubing bit opener Apr. 10, 1990
4889197 Hydraulic operated underreamer Dec. 26, 1989
4875738 Arm-supported cutting roll with effective length pivotally adjustable along mining face Oct. 24, 1989
4809793 Enhanced diameter clean-out tool and method Mar. 7, 1989
4715440 Downhole tools Dec. 29, 1987
4618009 Reaming tool Oct. 21, 1986
4616720 Divided-bucket type rotary excavator Oct. 14, 1986
4589504 Well bore enlarger May. 20, 1986
4548282 Method for sinking boreholes Oct. 22, 1985
4489985 Cutter drum extension latching mechanism Dec. 25, 1984
4407376 Under-reaming pile bore excavator Oct. 4, 1983
4406500 Cutting assembly including expanding wall segments of auger Sep. 27, 1983
4401171 Underreamer with debris flushing flow path Aug. 30, 1983
4366988 Sonic apparatus and method for slurry well bore mining and production Jan. 4, 1983
4354560 Apparatus for drilling enlarged boreholes Oct. 19, 1982
4354559 Enlarged borehole drilling method and apparatus Oct. 19, 1982
4316635 Extensible and retraciable rotor arm cutting assembly Feb. 23, 1982
4311343 Apparatus for breaking rock or concrete Jan. 19, 1982
4282941 Underreamer with large cutter elements and axial fluid passage Aug. 11, 1981
4282941 Underreamer with large cutter elements and axial fluid passage Aug. 11, 1981
4278137 Apparatus for extracting minerals through a borehole Jul. 14, 1981
4262758 Borehole angle control by gage corner removal from mechanical devices associated with drill bit and drill string Apr. 21, 1981
4219087 Enlarged bore hole drilling method Aug. 26, 1980
4189185 Method for producing chambered blast holes Feb. 19, 1980
4187920 Enlarged bore hole drilling method and apparatus Feb. 12, 1980
4186810 Fluid operated undercutter Feb. 5, 1980
4169510 Drilling and belling apparatus Oct. 2, 1979
4165784 Casing perforator Aug. 28, 1979
4081042 Stabilizer and rotary expansible drill bit apparatus Mar. 28, 1978
3938598 Belling apparatus Feb. 17, 1976
3934660 Flexpower deep well drill Jan. 27, 1976

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