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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
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