3866821

Information

• Patent Grant
• 3866821

• References
• Source

• Patent Number

  3,866,821

• Date Filed

  Not available

• Date Issued

  Tuesday, February 18, 1975
  50 years ago

• CPC

  • B65D5/46128 - two opposite closure flaps being provided with handle elements which are in contact with each other
  • B65D5/2038 - at least two opposed folded-up portions having a non-rectangular shape
  • B65D5/26 - with extensions of opposite sides mutually interlocking to lie against other sides

• US Classifications

  • 229 - Envelopes, wrappers, and paperboard boxes