2834954

Information

• Patent Grant
• 2834954

• References
• Source

• Patent Number

  2,834,954

• Date Filed

  Not available

• Date Issued

  Tuesday, May 13, 1958
  67 years ago

• CPC

  • H04M19/02 - providing ringing current or supervisory tones
  • H03B5/22 - active element in amplifier being vacuum tube

• US Classifications

  • 379 - Telephonic communications
  • 315 - Electric lamp and discharge devices: systems
  • 340 - Communications: electrical