3563668

Information

• Patent Grant
• 3563668

• References
• Source

• Patent Number

  3,563,668

• Date Filed

  Not available

• Date Issued

  Tuesday, February 16, 1971
  54 years ago

• CPC

  • G01N21/8916 - for testing photographic material
  • G03B35/24 - using apertured or refractive resolving means on screens or between screen and eye

• US Classifications

  • 356 - Optics: measuring and testing
  • 250 - Radiant energy