3323431

Information

• Patent Grant
• 3323431

• References
• Source

• Patent Number

  3,323,431

• Date Filed

  Not available

• Date Issued

  Tuesday, June 6, 1967
  57 years ago

• CPC

  • G01J1/124 - based on the comparison of the intensity of measured light with a comparison source or comparison illuminated surface

• US Classifications

  • 396 - Photography
  • 356 - Optics: measuring and testing