3648921

Information

• Patent Grant
• 3648921

• References
• Source

• Patent Number

  3,648,921

• Date Filed

  Not available

• Date Issued

  Tuesday, March 14, 1972
  52 years ago

• CPC

  • B65D5/541 - the lines of weakness being provided in one or more closure flaps
  • Y10S229/924 - Means to facilitate gripping a tear strip

• US Classifications

  • 229 - Envelopes, wrappers, and paperboard boxes