2235590

Information

• Patent Grant
• 2235590

• References
• Source

• Patent Number

  2,235,590

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1941
  83 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
  • 235 - Registers
  • 250 - Radiant energy
  • 355 - Photocopying