1980855

Information

• Patent Grant
• 1980855

• References
• Source

• Patent Number

  1,980,855

• Date Filed

  Not available

• Date Issued

  Tuesday, November 13, 1934
  90 years ago

• CPC

  • H01J1/20 - Cathodes heated indirectly by an electric current Cathodes heated by electron or ion bombardment
  • H01J17/52 - with one cathode and one anode
  • H02M7/046 - using discharge tubes

• US Classifications

  • 313 - Electric lamp and discharge devices