3620590

Information

• Patent Grant
• 3620590

• References
• Source

• Patent Number

  3,620,590

• Date Filed

  Not available

• Date Issued

  Tuesday, November 16, 1971
  53 years ago

• CPC

  • G03H1/041 - Optical element in the object space affecting the object beam, not otherwise provided for
  • G06K19/16 - the marking being a hologram or diffraction grating
  • G07C9/00055 - visually
  • Y10S283/904 - Credit card

• US Classifications

  • 380 - Cryptography
  • 283 - Printed matter
  • 430 - Radiation imagery chemistry: process, composition, or product thereof
  • 713 - Electrical computers and digital processing systems: support