3803441

Information

• Patent Grant
• 3803441

• References
• Source

• Patent Number

  3,803,441

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1974
  50 years ago

• CPC

  • H01J1/24 - Insulating layer or body located between heater and emissive material

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 174 - Electricity: conductors and insulators
  • 501 - Compositions: ceramic