3861493

Information

• Patent Grant
• 3861493

• References
• Source

• Patent Number

  3,861,493

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1975
  50 years ago

• CPC

  • E04B1/86 - slab-shaped
  • E04B9/04 - comprising slabs, panels, sheets or the like
  • E04C2/326 - with corrugations, incisions or reliefs in more than one direction of the element
  • E04F13/12 - of metal or with an outer layer of metal or enameled metal
  • E04B2001/8438 - Slot shaped holes
  • E04B2001/8442 - Tray type elements

• US Classifications

  • 181 - Acoustics
  • 052 - Static structures