3917973

Information

• Patent Grant
• 3917973

• References
• Source

• Patent Number

  3,917,973

• Date Filed

  Not available

• Date Issued

  Tuesday, November 4, 1975
  49 years ago

• CPC

  • H01J21/065 - Devices for short wave tubes
  • H01J1/20 - Cathodes heated indirectly by an electric current Cathodes heated by electron or ion bombardment
  • H01J19/34 - forming part of the envelope
  • H01J2893/0003 - Anodes forming part of vessel walls

• US Classifications

  • 313 - Electric lamp and discharge devices