3638621

Information

• Patent Grant
• 3638621

• References
• Source

• Patent Number

  3,638,621

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1972
  52 years ago

• CPC

  • F22B7/14 - with both auxiliary water tubes and auxiliary fire tubes

• US Classifications

  • 122 - Liquid heaters and vaporizers