3870891

Information

• Patent Grant
• 3870891

• References
• Source

• Patent Number

  3,870,891

• Date Filed

  Not available

• Date Issued

  Tuesday, March 11, 1975
  49 years ago

• CPC

  • H01J29/66 - using electromagnetic means only
  • H01J37/141 - Electromagnetic lenses

• US Classifications

  • 250 - Radiant energy