3720921

Information

• Patent Grant
• 3720921

• References
• Source

• Patent Number

  3,720,921

• Date Filed

  Not available

• Date Issued

  Tuesday, March 13, 1973
  52 years ago

• CPC

  • G11C13/045 - using photochromic storage elements

• US Classifications

  • 365 - Static information storage and retrieval
  • 359 - Optical: systems and elements