3765939

Information

• Patent Grant
• 3765939

• References
• Source

• Patent Number

  3,765,939

• Date Filed

  Not available

• Date Issued

  Tuesday, October 16, 1973
  51 years ago

• CPC

  • H01J9/08 - Manufacture of heaters for indirectly-heated cathodes

• US Classifications

  • 427 - Coating processes
  • 313 - Electric lamp and discharge devices