2474978

Information

• Patent Grant
• 2474978

• References
• Source

• Patent Number

  2,474,978

• Date Filed

  Not available

• Date Issued

  Tuesday, July 5, 1949
  75 years ago

• CPC

  • H03B5/10 - active element in amplifier being vacuum tube
  • H03D7/06 - by means of discharge tubes having more than two electrodes
  • H03F1/50 - with tubes only
  • H03F3/48 - with tubes only
  • H03F3/66 - Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
  • H04B1/26 - for superheterodyne receivers
  • H04J1/00 - Frequency-division multiplex systems

• US Classifications

  • 455 - Telecommunications
  • 330 - Amplifiers
  • 331 - Oscillators
  • 332 - Modulators