2491425

Information

• Patent Grant
• 2491425

• References
• Source

• Patent Number

  2,491,425

• Date Filed

  Not available

• Date Issued

  Tuesday, December 13, 1949
  75 years ago

• CPC

  • H01J17/54 - having one or more control electrodes

• US Classifications

  • 313 - Electric lamp and discharge devices