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Class Information
Number: 175/416
Name: Boring or penetrating the earth > Bit or bit element > Impact or percussion type > Noncircular bore cutter
Description: Apparatus in which the bit is formed so as to normally cut a hole which is noncircular in cross section.

Patents under this class:

Patent Number Title Of Patent Date Issued
8272458 Drill bit with replaceable blade members Sep. 25, 2012
7120565 Method and apparatus for determining figure Oct. 10, 2006
6213232 Drilling tool helical shank formed from a polygonal profile bar Apr. 10, 2001
5743345 Drill bit for reverse drilling Apr. 28, 1998
4844186 Replaceable well drill bit Jul. 4, 1989
4074778 Square hole drill Feb. 21, 1978
4071100 Method of making holes of selected external configuration in preferably rock or ground formation, and a drilling machine for carrying out the method Jan. 31, 1978
4056154 Squaring off and reaming tool for deep elongated trench excavations Nov. 1, 1977

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