1940890

Information

• Patent Grant
• 1940890

• References
• Source

• Patent Number

  1,940,890

• Date Filed

  Not available

• Date Issued

  Tuesday, December 26, 1933
  92 years ago

• CPC

  • E21B10/42 - Rotary drag type drill bits with teeth, blades or like cutting elements
  • Y10T279/17982 - Molded or cast-in tang

• US Classifications

  • 279 - Chucks or sockets
  • 175 - Boring or penetrating the earth