2413568

Information

• Patent Grant
• 2413568

• References
• Source

• Patent Number

  2,413,568

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1946
  78 years ago

• CPC

  • E04B1/8409 - sheet-shaped
  • E04B1/6125 - with protrusions on the one frontal surface co-operating with recesses in the other frontal surface
  • E04B2001/8281 - Flat elements mounted parallel to a supporting surface with an acoustically active air gap between the elements and the mounting surface
  • E04B2001/8433 - with holes in their face
  • E04B2001/8438 - Slot shaped holes
  • E04B2001/8442 - Tray type elements
  • E04B2001/8461 - layered
  • E04B2001/848 - the cavities opening onto the face of the element
  • E04B2001/849 - Groove or slot type openings
  • E04B2001/8495 - the openings going through from one face to the other face of the element

• US Classifications

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