2921731

Information

• Patent Grant
• 2921731

• References
• Source

• Patent Number

  2,921,731

• Date Filed

  Not available

• Date Issued

  Tuesday, January 19, 1960
  65 years ago

• CPC

  • B65D27/20 - using self-locking integral or attached elements

• US Classifications

  • 229 - Envelopes, wrappers, and paperboard boxes
  • 053 - Package making
  • 206 - Special receptacle or package
  • 383 - Flexible bags