1441994

Information

• Patent Grant
• 1441994

• References
• Source

• Patent Number

  1,441,994

• Date Filed

  Not available

• Date Issued

  Tuesday, January 9, 1923
  102 years ago

• CPC

  • B23B51/044 - with core holding devices
  • B23B2260/138 - Screw threads
  • Y10T408/8734 - including central Tool axially movable relative to support
  • Y10T408/8957 - and having stepped cutting edges

• US Classifications

  • 408 - Cutting by use of rotating axially moving tool