2021663

Information

• Patent Grant
• 2021663

• References
• Source

• Patent Number

  2,021,663

• Date Filed

  Not available

• Date Issued

  Tuesday, November 19, 1935
  90 years ago

• CPC

  • C01F11/16 - Purification
  • C04B2/10 - Preheating, burning calcining or cooling

• US Classifications

  • 423 - Chemistry of inorganic compounds