1747117

Information

• Patent Grant
• 1747117

• References
• Source

• Patent Number

  1,747,117

• Date Filed

  Not available

• Date Issued

  Tuesday, February 11, 1930
  95 years ago

• CPC

  • B23B51/10 - Bits for countersinking
  • B23B51/009 - Stepped drills
  • B23B51/02 - Twist drills
  • B23P15/32 - twist-drills
  • B23B2251/202 - Three cutting edges
  • B23B2251/241 - Cross sections of the diameter of the drill
  • B23B2251/406 - of special form not otherwise provided for
  • B23B2251/606 - being a twist drill
  • Y10T408/905 - Having stepped cutting edges

• US Classifications

  • 076 - Metal tools and implements, making
  • 408 - Cutting by use of rotating axially moving tool