1919933

Information

• Patent Grant
• 1919933

• References
• Source

• Patent Number

  1,919,933

• Date Filed

  Not available

• Date Issued

  Tuesday, July 25, 1933
  91 years ago

• CPC

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

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 315 - Electric lamp and discharge devices: systems