3681964

Information

• Patent Grant
• 3681964

• References
• Source

• Patent Number

  3,681,964

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1972
  52 years ago

• CPC

  • B21D28/36 - using rotatable work or tool holders
  • B21D28/28 - in tubes or other hollow bodies
  • B21D28/285 - punching outwards
  • E21B43/086 - Screens with preformed openings

• US Classifications

  • 072 - Metal deforming