3686802

Information

• Patent Grant
• 3686802

• References
• Source

• Patent Number

  3,686,802

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1972
  53 years ago

• CPC

  • E04D13/0477 - Underroof drainage layers
  • E04B7/028 - consisting of structures of pyramidal or conical shape
  • E04D2013/049 - of condensation water or infiltrated rainwater

• US Classifications

  • 052 - Static structures
  • 454 - Ventilation