2180988

Information

• Patent Grant
• 2180988

• References
• Source

• Patent Number

  2,180,988

• Date Filed

  Not available

• Date Issued

  Tuesday, November 21, 1939
  86 years ago

• CPC

  • H01J9/04 - of thermionic cathodes
  • H01J9/047 - Cathodes having impregnated bodies
  • H01J19/28 - Non-electron-emitting electrodes Screens
  • H01J2893/0011 - Non-emitting electrodes

• US Classifications

  • 445 - Electric lamp or space discharge component or device manufacturing
  • 266 - Metallurgical apparatus
  • 313 - Electric lamp and discharge devices
  • 419 - Powder metallurgy processes
  • 427 - Coating processes
  • 428 - Stock material or miscellaneous articles