1931742

Information

• Patent Grant
• 1931742

• References
• Source

• Patent Number

  1,931,742

• Date Filed

  Not available

• Date Issued

  Tuesday, October 24, 1933
  91 years ago

• CPC

  • G02B6/0071 - with elongated shape
  • G02B6/0031 - Reflecting element, sheet or layer
  • G02B6/005 - provided by one optical element, or plurality thereof, placed on the light output side of the light guide
  • G09F2013/1836 - using a frame-like light source

• US Classifications

  • 040 - Card, picture, or sign exhibiting