1652497

Information

• Patent Grant
• 1652497

• References
• Source

• Patent Number

  1,652,497

• Date Filed

  Not available

• Date Issued

  Tuesday, December 13, 1927
  97 years ago

• CPC

  • H01J21/16 - with external electrostatic control means and with or without internal control electrodes

• US Classifications

  • 313 - Electric lamp and discharge devices