2256171

Information

• Patent Grant
• 2256171

• References
• Source

• Patent Number

  2,256,171

• Date Filed

  Not available

• Date Issued

  Tuesday, September 16, 1941
  83 years ago

• CPC

  • G01N1/2853 - Shadowing samples
  • H01J37/21 - Means for adjusting the focus

• US Classifications

  • 850 - Scanning-probe techniques or apparatus