3574471

Information

• Patent Grant
• 3574471

• References
• Source

• Patent Number

  3,574,471

• Date Filed

  Not available

• Date Issued

  Tuesday, April 13, 1971
  53 years ago

• CPC

  • G01J1/48 - using chemical effects

• US Classifications

  • 356 - Optics: measuring and testing
  • 351 - Optics: eye examining, vision testing and correcting
  • 359 - Optical: systems and elements