3548641

Information

• Patent Grant
• 3548641

• References
• Source

• Patent Number

  3,548,641

• Date Filed

  Not available

• Date Issued

  Tuesday, December 22, 1970
  54 years ago

• CPC

  • G01N29/0636 - with permanent recording
  • G01N29/11 - by measuring attenuation of acoustic waves
  • G01N29/346 - with amplitude characteristics
  • G01N2291/044 - Internal reflections (echoes)

• US Classifications

  • 073 - Measuring and testing
  • 348 - Television