3879977

Information

• Patent Grant
• 3879977

• References
• Source

• Patent Number

  3,879,977

• Date Filed

  Not available

• Date Issued

  Tuesday, April 29, 1975
  49 years ago

• CPC

  • B21C37/124 - the tubes having a special shape
  • B21C37/185 - starting from sheet material
  • Y10S29/041 - Taper tube making

• US Classifications

  • 072 - Metal deforming
  • 029 - Metal working