3881569

Information

• Patent Grant
• 3881569

• References
• Source

• Patent Number

  3,881,569

• Date Filed

  Not available

• Date Issued

  Tuesday, May 6, 1975
  49 years ago

• CPC

  • G10K11/16 - Methods or devices for protecting against, or damping of, acoustic waves
  • E04B1/8218 - soundproof enclosures
  • A47B2220/13 - Sound or noise reduction or dampening
  • E04B2001/8433 - with holes in their face
  • E04B2001/8452 - with peripheral frame members
  • Y10T428/24322 - Composite web or sheet

• US Classifications

  • 181 - Acoustics
  • 428 - Stock material or miscellaneous articles