2129074

Information

• Patent Grant
• 2129074

• References
• Source

• Patent Number

  2,129,074

• Date Filed

  Not available

• Date Issued

  Tuesday, September 6, 1938
  86 years ago

• CPC

  • H03G7/001 - without controlling loop
  • H03G7/00 - Volume compression or expansion in amplifiers
  • H03G7/004 - using continuously variable impedance devices
  • H03G7/02 - having discharge tubes
  • H03G9/10 - for tone control and volume expansion or compression
  • H03G11/004 - using discharge tubes
  • H04B3/10 - by pilot signal

• US Classifications

  • 333 - Wave transmission lines and networks
  • 330 - Amplifiers