1997831

Information

• Patent Grant
• 1997831

• References
• Source

• Patent Number

  1,997,831

• Date Filed

  Not available

• Date Issued

  Tuesday, April 16, 1935
  91 years ago

• CPC

  • H01J17/04 - Electrodes Screens
  • H01J2893/0055 - Movable screens

• US Classifications

  • 313 - Electric lamp and discharge devices