3309979

Information

• Patent Grant
• 3309979

• References
• Source

• Patent Number

  3,309,979

• Date Filed

  Not available

• Date Issued

  Tuesday, March 21, 1967
  58 years ago

• CPC

  • F23L17/08 - with co-axial cones or louvres

• US Classifications

  • 454 - Ventilation