1982821

Information

• Patent Grant
• 1982821

• References
• Source

• Patent Number

  1,982,821

• Date Filed

  Not available

• Date Issued

  Tuesday, December 4, 1934
  90 years ago

• CPC

  • H01J19/30 - characterised by the material
  • H01J2893/0021 - carbon

• US Classifications

  • 252 - Compositions
  • 423 - Chemistry of inorganic compounds