3661139

Information

• Patent Grant
• 3661139

• References
• Source

• Patent Number

  3,661,139

• Date Filed

  Not available

• Date Issued

  Tuesday, May 9, 1972
  52 years ago

• CPC

  • F24H9/0052 - for air heaters

• US Classifications

  • 126 - Stoves and furnaces
  • 165 - Heat exchange