3721976

Information

• Patent Grant
• 3721976

• References
• Source

• Patent Number

  3,721,976

• Date Filed

  Not available

• Date Issued

  Tuesday, March 20, 1973
  52 years ago

• CPC

  • H04M1/515 - by generating or selecting other signals than trains of pulses of similar shape or other signals than currents of one or more different frequencies

• US Classifications

  • 341 - Coded data generation or conversion
  • 178 - Telegraphy
  • 714 - Error detection/correction and fault detection/recovery