2975853

Information

• Patent Grant
• 2975853

• References
• Source

• Patent Number

  2,975,853

• Date Filed

  Not available

• Date Issued

  Tuesday, March 21, 1961
  63 years ago

• CPC

  • E04C1/42 - of glass or other transparent material
  • E04B1/8404 - block-shaped
  • E04B2001/747 - Corrugated materials
  • E04B2001/748 - Honeycomb materials
  • E04B2001/8428 - containing specially shaped acoustical bodies
  • E04B2001/8433 - with holes in their face
  • E04B2001/8452 - with peripheral frame members

• US Classifications

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