3548722

Information

• Patent Grant
• 3548722

• References
• Source

• Patent Number

  3,548,722

• Date Filed

  Not available

• Date Issued

  Tuesday, December 22, 1970
  54 years ago

• CPC

  • B31B29/84 - Forming valves or applying valve inserts
  • B31D5/0034 - for making valve inserts for bags
  • B31B2219/9054 - Applying rigid valves, spouts, or filling tubes
  • B31B2221/20 - the bags having structural provision at the base for thickness of content

• US Classifications

  • 493 - Manufacturing container or tube from paper
  • 383 - Flexible bags