1335974

Information

• Patent Grant
• 1335974

• References
• Source

• Patent Number

  1,335,974

• Date Filed

  Not available

• Date Issued

  Tuesday, April 6, 1920
  104 years ago

• CPC

  • F22G7/02 - in fire tubes

• US Classifications

  • 122 - Liquid heaters and vaporizers
  • 165 - Heat exchange