1937957

Information

• Patent Grant
• 1937957

• References
• Source

• Patent Number

  1,937,957

• Date Filed

  Not available

• Date Issued

  Tuesday, December 5, 1933
  91 years ago

• CPC

  • G02B6/006 - to produce indicia, symbols, texts or the like
  • G02B6/0021 - for housing at least a part of the light source
  • G02B6/0036 - 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
  • G02B6/0065 - Manufacturing aspects; Material aspects
  • G02B6/0071 - with elongated shape
  • G09F2013/1836 - using a frame-like light source

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • 216 - Etching a substrate: processes
  • 313 - Electric lamp and discharge devices