Patents by Inventor John T. Schaefer

John T. Schaefer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the recovery of aluminum from alunite
    Patent number: 4075068
    Abstract: An improvement in the process for the recovery of aluminum from alunite in which potassium hydroxide is recovered from byproduct potassium sulfate by electrodialysis, further improvement being the use of sodium hydroxide from the bleed stream from the Bayer leach for use in the electrodialysis process for recovering potassium hydroxide from potassium sulfate.
    Type: Grant
    Filed: July 12, 1976
    Date of Patent: February 21, 1978
    Assignees: Southwire Company, National Steel Corporation, Earth Sciences, Inc.
    Inventors: Kent W. Loest, John T. Schaefer
  • Production of monobasic potassium phosphate by electrodialysis
    Patent number: 4033842
    Abstract: A continuous process for the production by electrodialysis of monobasic potassium phosphate from phosphoric acid produced by the wet process and potassium sulfate produced as a by-product in processes for the recovery of aluminum from alunite.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: July 5, 1977
    Assignees: Southwire Company, National Steel Corporation, Earth Sciences, Inc.
    Inventors: Kent W. Loest, John T. Schaefer