3688681

Information

• Patent Grant
• 3688681

• References
• Source

• Patent Number

  3,688,681

• Date Filed

  Not available

• Date Issued

  Tuesday, September 5, 1972
  52 years ago

• CPC

  • A01K1/0058 - Construction of air inlets or outlets in roofs
  • F04D25/166 - using fans
  • F24F12/001 - with heat-exchange between supplied and exhausted air
  • Y02B30/563 - Air to air
  • Y02P60/54 - Environmental control in livestock or poultry housing
  • Y02P60/542 - using renewable energy

• US Classifications

  • 454 - Ventilation