1969642

Information

• Patent Grant
• 1969642

• References
• Source

• Patent Number

  1,969,642

• Date Filed

  Not available

• Date Issued

  Tuesday, August 7, 1934
  90 years ago

• CPC

  • H01J61/14 - having one or more carbon compounds as the principal constituents

• US Classifications

  • 313 - Electric lamp and discharge devices