3777422

Information

• Patent Grant
• 3777422

• References
• Source

• Patent Number

  3,777,422

• Date Filed

  Not available

• Date Issued

  Tuesday, December 11, 1973
  50 years ago

• CPC

  • F24F7/02 - Roof ventilation
  • F24F2011/0097 - opening air passage in case of fire, excessive heat or smoke

• US Classifications

  • 049 - Movable or removable closures