1214991

Information

• Patent Grant
• 1214991

• References
• Source

• Patent Number

  1,214,991

• Date Filed

  Not available

• Date Issued

  Tuesday, February 6, 1917
  107 years ago

• CPC

  • C01F7/0686 - from sulfate-containing minerals

• US Classifications

  • 423 - Chemistry of inorganic compounds