3565209

Information

• Patent Grant
• 3565209

• References
• Source

• Patent Number

  3,565,209

• Date Filed

  Not available

• Date Issued

  Tuesday, February 23, 1971
  54 years ago

• CPC

  • H04R23/004 - using ionised gas
  • G01S1/72 - using ultrasonic, sonic or infrasonic waves
  • G10K15/04 - Sound-producing devices

• US Classifications

  • 181 - Acoustics
  • 060 - Power plants
  • 313 - Electric lamp and discharge devices