2220312

Information

• Patent Grant
• 2220312

• References
• Source

• Patent Number

  2,220,312

• Date Filed

  Not available

• Date Issued

  Tuesday, November 5, 1940
  84 years ago

• CPC

  • B31C7/02 - Forming truncated cones
  • B65D3/06 - essentially conical or frusto-conical

• US Classifications

  • 229 - Envelopes, wrappers, and paperboard boxes
  • 493 - Manufacturing container or tube from paper