1216628

Information

• Patent Grant
• 1216628

• References
• Source

• Patent Number

  1,216,628

• Date Filed

  Not available

• Date Issued

  Tuesday, February 20, 1917
  108 years ago

• CPC

  • E21B10/445 - percussion type
  • Y10T408/898 - Helical ribbon Tool
  • Y10T408/907 - including detailed shank
  • Y10T408/9093 - Each formed by a pair of axially facing facets

• US Classifications

  • 175 - Boring or penetrating the earth
  • 408 - Cutting by use of rotating axially moving tool