3640307

Information

• Patent Grant
• 3640307

• References
• Source

• Patent Number

  3,640,307

• Date Filed

  Not available

• Date Issued

  Tuesday, February 8, 1972
  52 years ago

• CPC

  • G01F1/42 - Orifices or nozzles
  • F24F11/04 - solely for controlling the rate of air-flow
  • Y10T137/8326 - Fluid pressure responsive indicator, recorder or alarm
  • Y10T137/87418 - Balanced valve
  • Y10T137/87442 - Rotary valve

• US Classifications

  • 137 - Fluid handling
  • 049 - Movable or removable closures
  • 454 - Ventilation