3921022

Information

• Patent Grant
• 3921022

• References
• Source

• Patent Number

  3,921,022

• Date Filed

  Not available

• Date Issued

  Tuesday, November 18, 1975
  49 years ago

• CPC

  • H01J29/52 - Arrangements for controlling intensity of ray or beam
  • H01J1/3042 - microengineered
  • H01J3/022 - with micro-engineered cathode
  • H01J9/025 - of field emission cathodes
  • H01J63/00 - Cathode-ray or electron-stream lamps
  • H01J2893/0031 - Tubes with material luminescing under electron bombardment

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 250 - Radiant energy
  • 445 - Electric lamp or space discharge component or device manufacturing