3506964

Information

• Patent Grant
• 3506964

• References
• Source

• Patent Number

  3,506,964

• Date Filed

  Not available

• Date Issued

  Tuesday, April 14, 1970
  54 years ago

• CPC

  • H04Q9/12 - using combinations of frequencies
  • B61L7/088 - Common line wire control using series of coded pulses
  • B61L27/0038 - Track-side control of safe travel of vehicle or vehicle train

• US Classifications

  • 340 - Communications: electrical