3139811

Information

• Patent Grant
• 3139811

• References
• Source

• Patent Number

  3,139,811

• Date Filed

  Not available

• Date Issued

  Tuesday, July 7, 1964
  60 years ago

• CPC

  • F16K17/006 - specially adapted for shelters
  • A62B13/00 - Special devices for ventilating gasproof shelters
  • Y10S454/902 - Air raid shelter ventilation
  • Y10T137/7866 - Plural seating
  • Y10T137/7875 - Pivoted valves
  • Y10T137/7901 - Valve head movably connected for accommodation to seat

• US Classifications

  • 454 - Ventilation
  • 137 - Fluid handling
  • 251 - Valves and valve actuation