3678718

Information

• Patent Grant
• 3678718

• References
• Source

• Patent Number

  3,678,718

• Date Filed

  Not available

• Date Issued

  Tuesday, July 25, 1972
  52 years ago

• CPC

  • B21D28/28 - in tubes or other hollow bodies
  • B21D31/02 - Stabbing or piercing
  • B26F1/0038 - from the inside
  • Y10T83/0596 - Cutting wall of hollow work
  • Y10T83/392 - One tool [either internal or external] having compound motion
  • Y10T83/398 - Internal tool is an active cutter

• US Classifications

  • 072 - Metal deforming
  • 083 - Cutting