3183304

Information

• Patent Grant
• 3183304

• References
• Source

• Patent Number

  3,183,304

• Date Filed

  Not available

• Date Issued

  Tuesday, May 11, 1965
  59 years ago

• CPC

  • H04M9/087 - using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
  • H04R3/02 - for preventing acoustic reaction

• US Classifications

  • 381 - Electrical audio signal processing systems and devices