Maintaining carburized case during neutral to the core heat...

Metal tools and implements – making – Blank or process – Drill

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C175S371000

Reexamination Certificate

active

07469618

ABSTRACT:
The preferred embodiments are directed toward methods and apparatus for manufacturing components for earth-boring drill bits. In the preferred embodiments, a portion of the component is coated and the component is exposed to a carbon-rich environment at an elevated temperature. During this exposure, some portions of the component are not coated. The preferred embodiments further comprise coating the areas that were exposed to the carbon-rich environment and exposing the component to an elevated temperature in an environment with carbon present. In one embodiment, a drill leg is coated (with the exception of the journal pin) and then exposed to a carbon-rich environment at an elevated temperature. In this embodiment, the journal pin is then coated and the drill leg is exposed to an elevated temperature with a percentage of carbon that is less than the initial carbon-rich environment.

REFERENCES:
patent: 2589811 (1952-03-01), Holcroft
patent: 2713480 (1955-07-01), Ruckstahl
patent: 2998237 (1961-08-01), De Coriolis et al.
patent: 3189336 (1965-06-01), Montagino
patent: 3275389 (1966-09-01), Neilson et al.
patent: 3356541 (1967-12-01), Cullen
patent: 3662996 (1972-05-01), Schwalm et al.
patent: 3836380 (1974-09-01), Kramer
patent: 3913988 (1975-10-01), Scales et al.
patent: 4012238 (1977-03-01), Scales
patent: 4036670 (1977-07-01), De Walt
patent: 4188242 (1980-02-01), Scales
patent: 4227945 (1980-10-01), Kitayama et al.
patent: 4303137 (1981-12-01), Fischer
patent: 4622006 (1986-11-01), Hohne
patent: 4708752 (1987-11-01), Kar
patent: 4726432 (1988-02-01), Scott et al.
patent: 4763880 (1988-08-01), Smith et al.
patent: 4867015 (1989-09-01), Kane et al.
patent: 4921025 (1990-05-01), Tipton et al.
patent: 5324366 (1994-06-01), Keil et al.
patent: 5407180 (1995-04-01), Keil et al.
patent: 5975223 (1999-11-01), Karlsson
patent: 6374704 (2002-04-01), Scott et al.
patent: 6444053 (2002-09-01), Spitsberg et al.
patent: 1455951 (1976-11-01), None
patent: 1559690 (1980-01-01), None
British Search Report for Appl. No. GB0620054.7 dated Oct. 25, 2006; (3 p.).
British Search Report for Appln. No. GB0517743.1; dated Nov. 16, 2005; (pp. 3).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Maintaining carburized case during neutral to the core heat... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Maintaining carburized case during neutral to the core heat..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maintaining carburized case during neutral to the core heat... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4023954

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.