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Class Information
Number: 175/407
Name: Boring or penetrating the earth > Bit or bit element > Noncutting portion forwardly of cutting portion (e.g., reamer) > Impact type
Description: Apparatus in which the cutting edge of the bit is of the type which is adapted to disintegrate the formation by percussive action.

Patents under this class:

Patent Number Title Of Patent Date Issued
8479846 Earth-boring tools including an impact material and methods of drilling through casing Jul. 9, 2013
8443875 Down hole tool with adjustable fluid viscosity May. 21, 2013
8439135 Down-the-hole drill hammer having an extendable drill bit assembly May. 14, 2013
7735584 Percussion hammer for enlarging drilled holes Jun. 15, 2010
7673706 Down-the-hole hammer with pilot and method of enlarging a hole Mar. 9, 2010
7347291 Bit assembly Mar. 25, 2008
6808030 Enlargement drilling system Oct. 26, 2004
6494272 Drilling system utilizing eccentric adjustable diameter blade stabilizer and winged reamer Dec. 17, 2002
6202768 Rock drilling tool and reamer for percussive drilling Mar. 20, 2001
5553676 Reversible expander Sep. 10, 1996
5174390 Modular cluster drill apparatus Dec. 29, 1992
4361197 Blast hole grooving bit and wear resistant compact Nov. 30, 1982
4317595 Chisel for a crust breaking facility Mar. 2, 1982
4106578 Percussion drill bit Aug. 15, 1978

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