2990027

Information

• Patent Grant
• 2990027

• References
• Source

• Patent Number

  2,990,027

• Date Filed

  Not available

• Date Issued

  Tuesday, June 27, 1961
  63 years ago

• CPC

  • E04B9/045 - being laminated
  • E04B9/001 - characterised by provisions for heat or sound insulation
  • E04B9/0457 - having closed internal cavities
  • E04B9/0471 - having a trapezoidal cross section

• US Classifications

  • 181 - Acoustics
  • 052 - Static structures