BI-METAL DRILL BIT

Number of patents in Portfolio can not be more than 2000

United States of America Patent

APP PUB NO 20140328640A1
SERIAL NO

14205577

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A bi-metal drill bit includes a body defining a cutting end and a shank end. At least a portion of the cutting end is formed of a first metal section and at least a portion of the shank end is formed of a second metal section that is welded to the first metal section. The first metal section has a first metal having a material hardness that is higher than a second material hardness of the second metal section. One of the first and second metal sections is treated either by coating or oxide treating so as to have a recognizable different appearance than the other of the first and second metal sections. A length to diameter ratio of the first metal section has been optimized to allow electrical resistance welding, provide better strength in the rear end after the tip breaks through a workpiece, and to minimize cost.

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Patent Owner(s)

Patent OwnerAddress
BLACK & DECKER INC1000 STANLEY DRIVE NEW BRITAIN CT 06053

International Classification(s)

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  • 2014 Application Filing Year
  • B23B Class
  • 472 Applications Filed
  • 409 Patents Issued To-Date
  • 86.66 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances201420152016201720182019202020210255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
JOHNSON, David N Doncaster, GB 27 425
SANTAMARINA, Aland Columbia, US 47 644
STEINBRUNNER, Glen V Bel Air, US 20 354

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Patent Citation Ranking

  • 2 Citation Count
  • B23B Class
  • 8.83 % this patent is cited more than
  • 11 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges403077225431101 - 1011 - 2021 - 3031 - 4041 - 5051 - 60100 +020406080100120140160180200220240260280300320340

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