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Class Information
Number: 384/95
Name: Bearings > Rotary bearing > Roller drill bit > Inserts or bearing surface detail
Description: Subject matter in which a bearing surface is modified (a) to receive a different material in a portion of the surface, (b) to receive thin strips (c) by special treatment to improve its antifriction, or wear resisting properties, or (d) by specified material therefor.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7387177 |
Bearing insert sleeve for roller cone bit |
Jun. 17, 2008 |
| 7241049 |
Micropore engagement surfaces for earth boring bit |
Jul. 10, 2007 |
| 7237627 |
Bearing and lubrication system for earth boring bit |
Jul. 3, 2007 |
| 6708786 |
Mounting attachment and bearing system for an industrial earth-boring cutter |
Mar. 23, 2004 |
| 6637528 |
Bit apparatus |
Oct. 28, 2003 |
| 6460635 |
Load responsive hydrodynamic bearing |
Oct. 8, 2002 |
| 6416224 |
Rolling cutter drill bits |
Jul. 9, 2002 |
| 6354740 |
Rolling cutter drill bits |
Mar. 12, 2002 |
| 6260635 |
Rotary cone drill bit with enhanced journal bushing |
Jul. 17, 2001 |
| 6220374 |
Rotary cone drill bit with enhanced thrust bearing flange |
Apr. 24, 2001 |
| 5868502 |
Thrust disc bearings for rotary cone air bits |
Feb. 9, 1999 |
| 5853245 |
Rock bit cutter retainer with differentially pitched threads |
Dec. 29, 1998 |
| 5842531 |
Rotary rock bit with infiltrated bearings |
Dec. 1, 1998 |
| 5794726 |
Rotary rock bit with infiltrated bearings |
Aug. 18, 1998 |
| 5642942 |
Thrust plugs for rotary cone air bits |
Jul. 1, 1997 |
| 5598895 |
Cutter assembly having a plurality of independently rotatable cutting units thereon |
Feb. 4, 1997 |
| 5593231 |
Hydrodynamic bearing |
Jan. 14, 1997 |
| 5586611 |
Drill bit having dual split bushings for cutter support and retention |
Dec. 24, 1996 |
| 5520492 |
Sliding parts and method of producing same |
May. 28, 1996 |
| 5518820 |
Case-hardened titanium aluminide bearing |
May. 21, 1996 |
| 5499688 |
PDC insert featuring side spiral wear pads |
Mar. 19, 1996 |
| 5498081 |
Bearing assembly incorporating shield ring precluding erosion |
Mar. 12, 1996 |
| 5485891 |
Cone drill bit |
Jan. 23, 1996 |
| 5342129 |
Bearing assembly with sidewall-brazed PCD plugs |
Aug. 30, 1994 |
| 5217080 |
Sealing system for a sealed bearing assembly |
Jun. 8, 1993 |
| 5199516 |
Modular drill bit |
Apr. 6, 1993 |
| 5161898 |
Aluminide coated bearing elements for roller cutter drill bits |
Nov. 10, 1992 |
| 5137097 |
Modular drill bit |
Aug. 11, 1992 |
| 5037212 |
Bearing structure for downhole motors |
Aug. 6, 1991 |
| 4934467 |
Drill bit wear resistant surface for elastomeric seal |
Jun. 19, 1990 |
| 4911255 |
Means for retaining roller cutters on rotary drill bit |
Mar. 27, 1990 |
| 4903786 |
Earth boring bit with improved two piece bearing and seal assembly |
Feb. 27, 1990 |
| 4899838 |
Earth boring bit with convergent cutter bearing |
Feb. 13, 1990 |
| 4889195 |
Drill bit direct drive for deep well drilling tools |
Dec. 26, 1989 |
| 4875532 |
Roller drill bit having radial-thrust pilot bushing incorporating anti-galling material |
Oct. 24, 1989 |
| 4874047 |
Method and apparatus for retaining roller cone of drill bit |
Oct. 17, 1989 |
| 4865137 |
Drilling apparatus and cutter |
Sep. 12, 1989 |
| 4825964 |
Arrangement for reducing seal damage between rotatable and stationary members |
May. 2, 1989 |
| 4802539 |
Polycrystalline diamond bearing system for a roller cone rock bit |
Feb. 7, 1989 |
| 4756631 |
Diamond bearing for high-speed drag bits |
Jul. 12, 1988 |
| 4753303 |
Earth boring bit with two piece bearing and rigid face seal assembly |
Jun. 28, 1988 |
| 4732491 |
Downhole motor bearing assembly |
Mar. 22, 1988 |
| 4729440 |
Transistion layer polycrystalline diamond bearing |
Mar. 8, 1988 |
| 4722615 |
Drilling apparatus and cutter therefor |
Feb. 2, 1988 |
| 4708496 |
Diamond bearing and manufacture thereof |
Nov. 24, 1987 |
| 4660444 |
Hardening of selected areas of an earth boring rockbit |
Apr. 28, 1987 |
| 4641976 |
Copper-based spinodal alloy bearings |
Feb. 10, 1987 |
| 4618269 |
Hardened bearing surface and method of forming same |
Oct. 21, 1986 |
| 4597456 |
Conical cutters for drill bits, and processes to produce same |
Jul. 1, 1986 |
| 4572306 |
Journal bushing drill bit construction |
Feb. 25, 1986 |
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