2531139

Information

• Patent Grant
• 2531139

• References
• Source

• Patent Number

  2,531,139

• Date Filed

  Not available

• Date Issued

  Tuesday, November 21, 1950
  74 years ago

• CPC

  • E21B36/025 - the burners being above ground or outside the bore hole

• US Classifications

  • 126 - Stoves and furnaces
  • 431 - Combustion