3820448

Information

• Patent Grant
• 3820448

• References
• Source

• Patent Number

  3,820,448

• Date Filed

  Not available

• Date Issued

  Friday, June 28, 1974
  50 years ago

• CPC

  • F24F7/02 - Roof ventilation
  • E04B7/12 - formed in bays

• US Classifications

  • 454 - Ventilation