3662116

Information

• Patent Grant
• 3662116

• References
• Source

• Patent Number

  3,662,116

• Date Filed

  Not available

• Date Issued

  Tuesday, May 9, 1972
  52 years ago

• CPC

  • H04Q5/08 - Signalling by continuous ac
  • H04M19/02 - providing ringing current or supervisory tones

• US Classifications

  • 379 - Telephonic communications