1920740

Information

• Patent Grant
• 1920740

• References
• Source

• Patent Number

  1,920,740

• Date Filed

  Not available

• Date Issued

  Tuesday, August 1, 1933
  91 years ago

• CPC

  • F23M5/02 - characterised by the shape of the bricks or blocks used
  • F23M2700/0056 - Bricks for water tube combustion chamber walls

• US Classifications

  • 122 - Liquid heaters and vaporizers