3815995

Information

• Patent Grant
• 3815995

• References
• Source

• Patent Number

  3,815,995

• Date Filed

  Not available

• Date Issued

  Tuesday, June 11, 1974
  50 years ago

• CPC

  • G01N21/67 - using electric arcs or discharges
  • H01J49/18 - using spark ionisation

• US Classifications

  • 356 - Optics: measuring and testing