3644048

Information

• Patent Grant
• 3644048

• References
• Source

• Patent Number

  3,644,048

• Date Filed

  Not available

• Date Issued

  Tuesday, February 22, 1972
  52 years ago

• CPC

  • G01J1/124 - based on the comparison of the intensity of measured light with a comparison source or comparison illuminated surface
  • G01J1/12 - using wholly visual means

• US Classifications

  • 356 - Optics: measuring and testing