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Drill bits and other articles of manufacture including a layer-manufactured shell integrally secured to a cast structure and methods of fabricating same

  • US 6,454,030 B1
  • Filed: 01/25/1999
  • Issued: 09/24/2002
  • Est. Priority Date: 01/25/1999
  • Status: Expired due to Term
First Claim
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1. A rotary-type earth-boring drill bit comprising:

  • a bit body having a first longitudinal extent and including;

    a bit crown having a second longitudinal extent less than said first longitudinal extent and comprising particulate material configured as a shell having a substantially hollow interior portion; and

    a core material including a first portion disposed within said substantially hollow interior portion of said bit crown and secured to said bit crown and a second portion extending longitudinally beyond said second longitudinal extent of said bit crown, said second portion of said core material forming at least a portion of an exterior, longitudinally extending surface of said bit body at a bit gage region located longitudinally adjacent said bit crown.

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