2230262

Information

• Patent Grant
• 2230262

• References
• Source

• Patent Number

  2,230,262

• Date Filed

  Not available

• Date Issued

  Tuesday, February 4, 1941
  84 years ago

• CPC

  • B61L23/18 - specially adapted for changing lengths of track sections in dependence upon speed and traffic density
  • F21S48/114 - Polarized light
  • F21V9/14 - for producing polarised light

• US Classifications

  • 359 - Optical: systems and elements
  • 250 - Radiant energy
  • 307 - Electrical transmission or interconnection systems
  • 315 - Electric lamp and discharge devices: systems
  • 362 - Illumination