1991897

Information

• Patent Grant
• 1991897

• References
• Source

• Patent Number

  1,991,897

• Date Filed

  Not available

• Date Issued

  Tuesday, February 19, 1935
  90 years ago

• CPC

  • F28D1/024 - with an air driving element
  • Y10S165/313 - Deflector with curved surface

• US Classifications

  • 165 - Heat exchange
  • 062 - Refrigeration
  • 392 - Electric resistance heating devices
  • 454 - Ventilation
  • D23 - Environmental heating and cooling