3504644

Information

• Patent Grant
• 3504644

• References
• Source

• Patent Number

  3,504,644

• Date Filed

  Not available

• Date Issued

  Tuesday, April 7, 1970
  54 years ago

• CPC

  • F41H7/035 - Gratings for ventilation openings
  • E06B7/082 - with rigid or slidable lamellae

• US Classifications

  • 109 - Safes, bank protection, or a related device
  • 454 - Ventilation