3588610

Information

• Patent Grant
• 3588610

• References
• Source

• Patent Number

  3,588,610

• Date Filed

  Not available

• Date Issued

  Monday, June 28, 1971
  53 years ago

• CPC

  • H02H1/0084 - by means of pilot wires or a telephone network; watching of these wires
  • H04L27/10 - Frequency-modulated carrier systems
  • Y10T307/852 - Frequency

• US Classifications

  • 361 - Electricity: electrical systems and devices
  • 307 - Electrical transmission or interconnection systems
  • 340 - Communications: electrical
  • 379 - Telephonic communications