2454812

Information

• Patent Grant
• 2454812

• References
• Source

• Patent Number

  2,454,812

• Date Filed

  Not available

• Date Issued

  Tuesday, November 30, 1948
  77 years ago

• CPC

  • H04M3/40 - Applications of speech amplifiers
  • H03F3/64 - with tubes only
  • H03F13/00 - Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers

• US Classifications

  • 379 - Telephonic communications
  • 330 - Amplifiers
  • 338 - Electrical resistors