1816220

Information

• Patent Grant
• 1816220

• References
• Source

• Patent Number

  1,816,220

• Date Filed

  Not available

• Date Issued

  Tuesday, July 28, 1931
  94 years ago

• CPC

  • G02B6/0033 - Means for improving the coupling-out of light from the light guide
  • G02B6/0021 - for housing at least a part of the light source
  • G02B6/0051 - Diffusing sheet or layer
  • G02B6/0071 - with elongated shape
  • G02B6/0083 - Details of electrical connections of light sources to drivers, circuit boards, or the like
  • G09F2013/1836 - using a frame-like light source

• US Classifications

  • 040 - Card, picture, or sign exhibiting