Case hardened roller cutter for a rotary drill bit and method of making

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4969378
SERIAL NO

07420872

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A roller cutter (28) for a rotary drill bit (10) and method of making, utilizing an ion nitriding hardening process for the external surface (42) and the internal bearing surfaces (33, 34, 38) in the central cavity (30) of the roller cutter (28). The roller cutter (28) is made from a through hardenable steel and the ion nitrided hardened layer (77) has a total thickness less than around 0.030 inch. Hardened layer (77) has a relatively thick inner stratum (80) and a relatively thin outer surface stratum (78). The outer stratum (78) is formed of Fe.sub.4 N having a thickness no greater than around 0.0004 inch to form an outer surface which is ductile and has a relatively low friction coefficient.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

Patent OwnerAddress
REEDHYCALOG L P400 N SAM HOUSTON PARKWAY EAST SUITE 900 HOUSTON TX 77060

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Drake, Eric F Pearland, TX 18 801
Lu, Mou-Chih Houston, TX 3 153

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation