1984426

Information

• Patent Grant
• 1984426

• References
• Source

• Patent Number

  1,984,426

• Date Filed

  Not available

• Date Issued

  Tuesday, December 18, 1934
  90 years ago

• CPC

  • H01J61/74 - having a main light-emitting filling of difficult vaporisable metal vapour

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 215 - Bottles and jars
  • 501 - Compositions: ceramic