3581543

Information

• Patent Grant
• 3581543

• References
• Source

• Patent Number

  3,581,543

• Date Filed

  Not available

• Date Issued

  Tuesday, June 1, 1971
  53 years ago

• CPC

  • B21D17/04 - by rolling
  • B21D53/76 - writing or drawing instruments
  • Y10T29/49877 - of flexible wall, expansible chamber devices [e.g., bellows]

• US Classifications

  • 072 - Metal deforming
  • 029 - Metal working