2499177

Information

• Patent Grant
• 2499177

• References
• Source

• Patent Number

  2,499,177

• Date Filed

  Not available

• Date Issued

  Tuesday, February 28, 1950
  75 years ago

• CPC

  • G08G5/0026 - located on the ground
  • G01S11/023 - using impedance elements varying with distance
  • G08G1/042 - using inductive or magnetic detectors
  • G08G5/065 - Navigation or guidance aids

• US Classifications

  • 455 - Telecommunications
  • 180 - Motor vehicles
  • 246 - Railway switches and signals
  • 340 - Communications: electrical
  • 379 - Telephonic communications