2745008

Information

• Patent Grant
• 2745008

• References
• Source

• Patent Number

  2,745,008

• Date Filed

  Not available

• Date Issued

  Tuesday, May 8, 1956
  70 years ago

• CPC

  • H04M19/02 - providing ringing current or supervisory tones
  • H03B5/22 - active element in amplifier being vacuum tube
  • H03B23/00 - Generation of oscillations periodically swept over a predetermined frequency range

• US Classifications

  • 331 - Oscillators
  • 330 - Amplifiers
  • 332 - Modulators
  • 379 - Telephonic communications