3558444

Information

• Patent Grant
• 3558444

• References
• Source

• Patent Number

  3,558,444

• Date Filed

  Not available

• Date Issued

  Tuesday, January 26, 1971
  54 years ago

• CPC

  • G01B11/20 - using brittle lacquer
  • G01N21/91 - using penetration of dyes

• US Classifications

  • 205 - Electrolysis: processes, compositions used therein, and methods of preparing the compositions
  • 073 - Measuring and testing
  • 356 - Optics: measuring and testing