3490838

Information

• Patent Grant
• 3490838

• References
• Source

• Patent Number

  3,490,838

• Date Filed

  Not available

• Date Issued

  Tuesday, January 20, 1970
  55 years ago

• CPC

  • G09F9/405 - the selected character being projected on a common screen accommodating only one character at a time, to provide the same display position for all characters
  • G03B21/134 - Projectors combined with typing apparatus or with printing apparatus
  • G08B5/36 - using visible light sources

• US Classifications

  • 353 - Optics: image projectors
  • 396 - Photography