1977689

Information

• Patent Grant
• 1977689

• References
• Source

• Patent Number

  1,977,689

• Date Filed

  Not available

• Date Issued

  Tuesday, October 23, 1934
  90 years ago

• CPC

  • B61L5/1845 - Optical systems, lenses
  • G02B3/08 - with discontinuous faces
  • G02B19/0014 - at least one surface having optical power
  • G02B19/0061 - the light source comprising a LED
  • G08G1/095 - Traffic lights
  • F21V5/02 - of prismatic shape
  • F21V7/0091 - using total internal reflection
  • F21W2111/00 - Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in code F21W2101/00

• US Classifications

  • 340 - Communications: electrical
  • 359 - Optical: systems and elements
  • 362 - Illumination