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Class Information
Number: 175/387
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Leading portion is core forming type
Description: Apparatus in which the leading or pilot portion has a cutter element or cutting edge so arranged that the bit makes an annular cut in the formation, leaving a central undisturbed portion of the formation in the form of a cylinder.

Patents under this class:

Patent Number Title Of Patent Date Issued
8025466 Removable countersink bit Sep. 27, 2011
7055632 Well stimulation tool and method for inserting a backpressure plug through a mandrel of the tool Jun. 6, 2006
7021404 Method and device for deviated coring and/or drilling Apr. 4, 2006
5643069 Drill for drilling brittle materials Jul. 1, 1997
5038873 Drilling tool with retractable pilot drilling unit Aug. 13, 1991
4552231 Rotating pilot core bit for use in highly fractured formations Nov. 12, 1985
4440247 Rotary earth drilling bit Apr. 3, 1984
4324300 Rotary drill bit Apr. 13, 1982
3955631 Soil sampler May. 11, 1976

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