3657975

Information

• Patent Grant
• 3657975

• References
• Source

• Patent Number

  3,657,975

• Date Filed

  Not available

• Date Issued

  Tuesday, April 25, 1972
  52 years ago

• CPC

  • B31B19/84 - Forming valves or applying valve inserts
  • B31B2219/9067 - Applying patches or flexible valve inserts

• US Classifications

  • 493 - Manufacturing container or tube from paper