3921891

Information

• Patent Grant
• 3921891

• References
• Source

• Patent Number

  3,921,891

• Date Filed

  Not available

• Date Issued

  Tuesday, November 25, 1975
  49 years ago

• CPC

  • B65D5/48034 - by folding a single blank

• US Classifications

  • 229 - Envelopes, wrappers, and paperboard boxes