3861804

Information

• Patent Grant
• 3861804

• References
• Source

• Patent Number

  3,861,804

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1975
  50 years ago

• CPC

  • G01N21/45 - using interferometric methods using Schlieren methods
  • G01J9/02 - by interferometric methods
  • G01N21/8422 - Investigating thin films
  • H04N5/82 - using deformable thermoplastic recording medium

• US Classifications

  • 356 - Optics: measuring and testing
  • 346 - Recorders
  • 386 - Motion video signal processing for recording or reproducing