3773981

Information

• Patent Grant
• 3773981

• References
• Source

• Patent Number

  3,773,981

• Date Filed

  Not available

• Date Issued

  Tuesday, November 20, 1973
  51 years ago

• CPC

  • H04J3/02 - Details
  • H04L5/245 - with a number of discharge tubes or semiconductor elements which successively connect the different channels to the transmission channels
  • H04Q1/457 - with conversion of multifrequency signals into digital signals

• US Classifications

  • 370 - Multiplex communications