3422921

Information

• Patent Grant
• 3422921

• References
• Source

• Patent Number

  3,422,921

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1969
  55 years ago

• CPC

  • E04B1/86 - slab-shaped
  • E04B2001/748 - Honeycomb materials
  • E04B2001/8254 - Soundproof supporting of building elements
  • E04B2001/8428 - containing specially shaped acoustical bodies

• US Classifications

  • 181 - Acoustics