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Class Information
Number: 175/379
Name: Boring or penetrating the earth > Bit or bit element > Cutting edge self-renewable during operation
Description: Apparatus in which the bit is provided with (1) relatively movable parts which are adapted to move during operation to provide a new cutting edge or (2) a body in the form of repeating similar structure extending longitudinally of the bit such that a new cutting edge is provided when the original cutter edge becomes worn.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6962217 |
Rotary drill bit compensating for changes in hardness of geological formations |
Nov. 8, 2005 |
| 6932172 |
Rotary contact structures and cutting elements |
Aug. 23, 2005 |
| 6843333 |
Impregnated rotary drag bit |
Jan. 18, 2005 |
| 6547017 |
Rotary drill bit compensating for changes in hardness of geological formations |
Apr. 15, 2003 |
| 6510906 |
Impregnated bit with PDC cutters in cone area |
Jan. 28, 2003 |
| 6454028 |
Wear resistant drill bit |
Sep. 24, 2002 |
| 6095265 |
Impregnated drill bits with adaptive matrix |
Aug. 1, 2000 |
| 5868125 |
Crenelated abrasive tool |
Feb. 9, 1999 |
| 5836409 |
Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys |
Nov. 17, 1998 |
| 5679445 |
Composite cermet articles and method of making |
Oct. 21, 1997 |
| 5677042 |
Composite cermet articles and method of making |
Oct. 14, 1997 |
| 5615747 |
Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys |
Apr. 1, 1997 |
| 5301762 |
Drilling tool fitted with self-sharpening cutting edges |
Apr. 12, 1994 |
| 5135061 |
Cutting elements for rotary drill bits |
Aug. 4, 1992 |
| 5025873 |
Self-renewing multi-element cutting structure for rotary drag bit |
Jun. 25, 1991 |
| 5012863 |
Pipe milling tool blade and method of dressing same |
May. 7, 1991 |
| 4898252 |
Cutting structures for rotary drill bits |
Feb. 6, 1990 |
| 4813500 |
Expendable diamond drag bit |
Mar. 21, 1989 |
| 4727946 |
Rotary drill bits |
Mar. 1, 1988 |
| 4719979 |
Expendable diamond drag bit |
Jan. 19, 1988 |
| 4690228 |
Changeover bit for extended life, varied formations and steady wear |
Sep. 1, 1987 |
| 4596296 |
Rotary drill bits |
Jun. 24, 1986 |
| 4593777 |
Drag bit and cutters |
Jun. 10, 1986 |
| 4558753 |
Drag bit and cutters |
Dec. 17, 1985 |
| 4533004 |
Self sharpening drag bit for sub-surface formation drilling |
Aug. 6, 1985 |
| 4478296 |
Drill bit having multiple drill rod impact members |
Oct. 23, 1984 |
| 4394882 |
Continuous chain bit with downhole cycling capability |
Jul. 26, 1983 |
| 4359335 |
Method of fabrication of rock bit inserts of tungsten carbide (WC) and cobalt (Co) with cutting surface wear pad of relative hardness and body portion of relative toughness sintered as an inte |
Nov. 16, 1982 |
| 4324300 |
Rotary drill bit |
Apr. 13, 1982 |
| D262630 |
Drill bit |
Jan. 12, 1982 |
| 4290498 |
Ablatible drill |
Sep. 22, 1981 |
| 4252201 |
Drilling method and apparatus |
Feb. 24, 1981 |
| 4234048 |
Drill bits embodying impregnated segments |
Nov. 18, 1980 |
| 4230194 |
Rotary drill bit |
Oct. 28, 1980 |
| 4230193 |
Rotary drill bit |
Oct. 28, 1980 |
| 4190126 |
Rotary abrasive drilling bit |
Feb. 26, 1980 |
| 4128136 |
Drill bit |
Dec. 5, 1978 |
| 4114322 |
Abrasive member |
Sep. 19, 1978 |
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