2779429

Information

• Patent Grant
• 2779429

• References
• Source

• Patent Number

  2,779,429

• Date Filed

  Not available

• Date Issued

  Tuesday, January 29, 1957
  67 years ago

• CPC

  • E04B1/8409 - sheet-shaped
  • E04B2001/747 - Corrugated materials
  • E04B2001/8281 - Flat elements mounted parallel to a supporting surface with an acoustically active air gap between the elements and the mounting surface
  • E04B2001/8414 - with non-planar face
  • E04B2001/8461 - layered
  • E04B2001/8471 - with non-planar interior transition surfaces between layers
  • E04B2001/8485 - the opening being restricted
  • 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