3821923

Information

• Patent Grant
• 3821923

• References
• Source

• Patent Number

  3,821,923

• Date Filed

  Not available

• Date Issued

  Tuesday, July 2, 1974
  50 years ago

• CPC

  • E05F1/002 - controlled by automatically acting means
  • E04D13/0351 - the parts pivoting about a fixed axis
  • F24F7/02 - Roof ventilation
  • E05Y2900/152 - Roof windows
  • F24F2011/0097 - opening air passage in case of fire, excessive heat or smoke

• US Classifications

  • 454 - Ventilation
  • 049 - Movable or removable closures