1381490

Information

• Patent Grant
• 1381490

• References
• Source

• Patent Number

  1,381,490

• Date Filed

  Not available

• Date Issued

  Tuesday, June 14, 1921
  103 years ago

• CPC

  • F24H7/0483 - the transfer fluid being air

• US Classifications

  • 126 - Stoves and furnaces
  • 237 - Heating systems
  • 454 - Ventilation