3919642

Information

• Patent Grant
• 3919642

• References
• Source

• Patent Number

  3,919,642

• Date Filed

  Not available

• Date Issued

  Tuesday, November 11, 1975
  50 years ago

• CPC

  • G08C15/10 - the signals being represented by frequencies or phase of current or voltage in transmission link

• US Classifications

  • 455 - Telecommunications
  • 324 - Electricity: measuring and testing
  • 340 - Communications: electrical