2147809

Information

• Patent Grant
• 2147809

• References
• Source

• Patent Number

  2,147,809

• Date Filed

  Not available

• Date Issued

  Tuesday, February 21, 1939
  87 years ago

• CPC

  • H01P5/225 - 180° reversed phase hybrid rings
  • G01R27/02 - Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom
  • H01P5/22 - Hybrid ring junctions
  • H04B1/54 - using the same frequency for two directions of communication

• US Classifications

  • 455 - Telecommunications
  • 324 - Electricity: measuring and testing
  • 333 - Wave transmission lines and networks