2190553

Information

• Patent Grant
• 2190553

• References
• Source

• Patent Number

  2,190,553

• Date Filed

  Not available

• Date Issued

  Tuesday, February 13, 1940
  84 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

  • 356 - Optics: measuring and testing