3838391

Information

• Patent Grant
• 3838391

• References
• Source

• Patent Number

  3,838,391

• Date Filed

  Not available

• Date Issued

  Tuesday, September 24, 1974
  50 years ago

• CPC

  • G08G1/02 - using treadles built into the road
  • E01F13/105 - depressible by right-way traffic
  • E01F13/126 - Pitfall barriers, causing the vehicle to face a step-like obstruction

• US Classifications

  • 340 - Communications: electrical
  • 404 - Road structure, process, or apparatus