1598022

Information

• Patent Grant
• 1598022

• References
• Source

• Patent Number

  1,598,022

• Date Filed

  Not available

• Date Issued

  Tuesday, August 31, 1926
  98 years ago

• CPC

  • G01J1/14 - using comparison with a surface of graded brightness

• US Classifications

  • 356 - Optics: measuring and testing
  • D16 - Photography and optical equipment