3864577

Information

• Patent Grant
• 3864577

• References
• Source

• Patent Number

  3,864,577

• Date Filed

  Not available

• Date Issued

  Tuesday, February 4, 1975
  49 years ago

• CPC

  • G01F23/2924 - for several discrete levels

• US Classifications

  • 250 - Radiant energy
  • 073 - Measuring and testing
  • 356 - Optics: measuring and testing