3839890

Information

• Patent Grant
• 3839890

• References
• Source

• Patent Number

  3,839,890

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1974
  50 years ago

• CPC

  • B21D51/36 - collapsible or like thin-walled tubes
  • B21C23/20 - by backward extrusion
  • B21C25/00 - Profiling tools for metal extruding

• US Classifications

  • 072 - Metal deforming