3680422

Information

• Patent Grant
• 3680422

• References
• Source

• Patent Number

  3,680,422

• Date Filed

  Not available

• Date Issued

  Tuesday, August 1, 1972
  52 years ago

• CPC

  • B21D28/285 - punching outwards
  • B21D28/28 - in tubes or other hollow bodies
  • B21D31/02 - Stabbing or piercing
  • E21B43/086 - Screens with preformed openings
  • Y10T29/496 - Multiperforated metal article making
  • Y10T83/39 - Synchronized tool and work feeding means
  • Y10T83/9425 - Tool pair

• US Classifications

  • 083 - Cutting
  • 029 - Metal working
  • 072 - Metal deforming