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Construction
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
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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