2921981

Information

• Patent Grant
• 2921981

• References
• Source

• Patent Number

  2,921,981

• Date Filed

  Not available

• Date Issued

  Tuesday, January 19, 1960
  65 years ago

• CPC

  • H04H20/88 - Stereophonic broadcast systems
  • H04J3/00 - Time-division multiplex systems
  • H04J7/02 - in which the polarity of the amplitude is characteristic

• US Classifications

  • 370 - Multiplex communications
  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
  • 329 - Demodulators
  • 332 - Modulators
  • 381 - Electrical audio signal processing systems and devices