1920921

Information

• Patent Grant
• 1920921

• References
• Source

• Patent Number

  1,920,921

• Date Filed

  Not available

• Date Issued

  Tuesday, August 1, 1933
  91 years ago

• CPC

  • H05B31/065 - for flame arc lamps

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 252 - Compositions