3857565

Information

• Patent Grant
• 3857565

• References
• Source

• Patent Number

  3,857,565

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1974
  50 years ago

• CPC

  • A63F9/0613 - Puzzles or games based on the use of optical filters or elements
  • A63F2009/2467 - of a slide

• US Classifications

  • 273 - Amusement devices: games
  • 353 - Optics: image projectors