2140840

Information

• Patent Grant
• 2140840

• References
• Source

• Patent Number

  2,140,840

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1938
  86 years ago

• CPC

  • A61N1/00 - Electrotherapy Circuits therefor
  • A61B5/12 - Audiometering Evaluation or the auditory system, not limited to hearing capacity
  • H04L27/02 - Amplitude-modulated carrier systems
  • Y10S84/13 - Gas discharge tube
  • Y10S84/20 - Monophonic

• US Classifications

  • 331 - Oscillators
  • 084 - Music
  • 123 - Internal-combustion engines
  • 315 - Electric lamp and discharge devices: systems