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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 |
| 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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