3812931

Information

• Patent Grant
• 3812931

• References
• Source

• Patent Number

  3,812,931

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1974
  51 years ago

• CPC

  • G10K11/172 - using resonance effects
  • E01F8/0052 - Grate-style
  • F01N1/02 - by using resonance

• US Classifications

  • 181 - Acoustics