3922074

Information

• Patent Grant
• 3922074

• References
• Source

• Patent Number

  3,922,074

• Date Filed

  Not available

• Date Issued

  Tuesday, November 25, 1975
  49 years ago

• CPC

  • G03B41/00 - Special techniques not covered by groups G03B31/00 - G03B39/00 Apparatus therefor
  • G07D7/125 - Holograms or other interface patterns
  • G07D7/128 - Viewing devices
  • B42D25/00 - Information-bearing cards or sheet-like structures characterised by identification or security features Manufacture thereof
  • B42D2033/14 - Photosensitive material
  • B42D2035/34 - Markings visible under particular conditions or containing coded information
  • Y10S359/90 - Methods

• US Classifications

  • 380 - Cryptography
  • 283 - Printed matter
  • 359 - Optical: systems and elements
  • 396 - Photography
  • 434 - Education and demonstration
  • 713 - Electrical computers and digital processing systems: support