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Class Information
Number: 175/335
Name: Boring or penetrating the earth > Bit or bit element > Rolling cutter bit or rolling cutter bit element > Bit with leading cutter forming smaller diameter initial bore > Leading fixed cutter
Description: Apparatus in which the leading cutter or pilot comprises a cutter element or cutting edge other than a rolling cutter element or portion thereof.

Patents under this class:

Patent Number Title Of Patent Date Issued
8347989 Hole opener with hybrid reaming section and method of making Jan. 8, 2013
8336646 Hybrid bit with variable exposure Dec. 25, 2012
8157026 Hybrid bit with variable exposure Apr. 17, 2012
8112258 PDC drill bit using optimized side rake angle Feb. 7, 2012
8028769 Reamer with stabilizers for use in a wellbore Oct. 4, 2011
7293617 Polycrystaline diamond compact insert reaming tool Nov. 13, 2007
7137463 Polycrystaline diamond compact insert reaming tool Nov. 21, 2006
6902014 Roller cone bi-center bit Jun. 7, 2005
6883624 Multi-lobed cutter element for drill bit Apr. 26, 2005
6739416 Enhanced offset stabilization for eccentric reamers May. 25, 2004
6609580 Polycrystalline diamond compact insert reaming tool Aug. 26, 2003
5417292 Large diameter rock drill May. 23, 1995
5133269 Plant hole digger with cylindrical cutter Jul. 28, 1992
4813501 Rotary mining bit Mar. 21, 1989
4448269 Cutter head for pit-boring machine May. 15, 1984
4096917 Earth drilling knobby bit Jun. 27, 1978
3998283 Earth boring auger Dec. 21, 1976
3998282 Earth boring auger Dec. 21, 1976

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