3662670

Information

• Patent Grant
• 3662670

• References
• Source

• Patent Number

  3,662,670

• Date Filed

  Not available

• Date Issued

  Tuesday, May 16, 1972
  52 years ago

• CPC

  • F16K1/165 - with a plurality of closure members
  • F16K17/006 - specially adapted for shelters
  • Y10S454/902 - Air raid shelter ventilation

• US Classifications

  • 454 - Ventilation