3807868

Information

• Patent Grant
• 3807868

• References
• Source

• Patent Number

  3,807,868

• Date Filed

  Not available

• Date Issued

  Tuesday, April 30, 1974
  51 years ago

• CPC

  • G01N21/474 - Details of optical heads therefor
  • G01N21/21 - Polarisation-affecting properties
  • G01N33/346 - paper sheets
  • G01N2021/8681 - Paper fibre orientation

• US Classifications

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