1997986

Information

• Patent Grant
• 1997986

• References
• Source

• Patent Number

  1,997,986

• Date Filed

  Not available

• Date Issued

  Tuesday, April 16, 1935
  89 years ago

• CPC

  • H01J21/08 - with movable electrode or electrodes
  • H01J17/04 - Electrodes Screens
  • H01J2893/0055 - Movable screens

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 033 - Geometrical instruments