3804990

Information

• Patent Grant
• 3804990

• References
• Source

• Patent Number

  3,804,990

• Date Filed

  Not available

• Date Issued

  Tuesday, April 16, 1974
  50 years ago

• CPC

  • H04J3/177 - Freeze-out systems
  • H04J3/172 - Digital speech interpolation

• US Classifications

  • 370 - Multiplex communications