3815486

Information

• Patent Grant
• 3815486

• References
• Source

• Patent Number

  3,815,486

• Date Filed

  Not available

• Date Issued

  Tuesday, June 11, 1974
  50 years ago

• CPC

  • F24F13/072 - of elongated shape
  • F24F13/0263 - Insulation for air ducts
  • E04B2009/026 - the supporting ceiling grid acting as air diffusers

• US Classifications

  • 454 - Ventilation