2977842

Information

• Patent Grant
• 2977842

• References
• Source

• Patent Number

  2,977,842

• Date Filed

  Not available

• Date Issued

  Tuesday, April 4, 1961
  63 years ago

• CPC

  • G01N21/431 - Dip refractometers
  • G01N33/346 - paper sheets
  • Y10S73/11 - Photoelectric cell

• US Classifications

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