3731438

Information

• Patent Grant
• 3731438

• References
• Source

• Patent Number

  3,731,438

• Date Filed

  Not available

• Date Issued

  Tuesday, May 8, 1973
  51 years ago

• CPC

  • E04D1/265 - the roofing elements being rigid
  • E04B7/02 - with plane sloping surfaces
  • E04D3/35 - Roofing slabs or stiff sheets comprising two or more layers
  • E04D3/40 - Slabs or sheets locally modified for auxiliary purposes
  • E04D13/0445 - Drainage channels
  • E04D2001/304 - at roof intersections
  • E04D2001/305 - Ridge or hip tiles
  • E04D2013/0454 - at the intersection of roof surfaces

• US Classifications

  • 052 - Static structures
  • D25 - Building units and construction elements