2205312

Information

• Patent Grant
• 2205312

• References
• Source

• Patent Number

  2,205,312

• Date Filed

  Not available

• Date Issued

  Tuesday, June 18, 1940
  84 years ago

• CPC

  • G01J1/40 - using limit or visibility or extinction effect

• US Classifications

  • 356 - Optics: measuring and testing
  • 235 - Registers