3637131

Information

• Patent Grant
• 3637131

• References
• Source

• Patent Number

  3,637,131

• Date Filed

  Not available

• Date Issued

  Tuesday, January 25, 1972
  53 years ago

• CPC

  • B65D5/26 - with extensions of opposite sides mutually interlocking to lie against other sides
  • B65D5/4204 - Inspection openings or windows
  • B65D5/546 - the lines of weakness being provided in an extension panel or tab of a hinged closure
  • B65D5/6667 - and connected to one another in order to form an uninterrupted telescoping flange

• US Classifications

  • 229 - Envelopes, wrappers, and paperboard boxes