2206521

Information

• Patent Grant
• 2206521

• References
• Source

• Patent Number

  2,206,521

• Date Filed

  Not available

• Date Issued

  Tuesday, July 2, 1940
  84 years ago

• CPC

  • G01J3/14 - using refracting elements
  • G01J3/10 - Arrangements of light sources specially adapted for spectrometry or colorimetry
  • G01J2003/1278 - Mask with spectral selection

• US Classifications

  • 356 - Optics: measuring and testing
  • 362 - Illumination