1981245

Information

• Patent Grant
• 1981245

• References
• Source

• Patent Number

  1,981,245

• Date Filed

  Not available

• Date Issued

  Tuesday, November 20, 1934
  90 years ago

• CPC

  • H01J17/063 - Indirectly heated cathodes

• US Classifications

  • 428 - Stock material or miscellaneous articles
  • 252 - Compositions
  • 313 - Electric lamp and discharge devices
  • 419 - Powder metallurgy processes
  • 445 - Electric lamp or space discharge component or device manufacturing