Patents by Inventor Julian V. Copenhaver

Julian V. Copenhaver 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).

  • Redox treatment of alunite ore
    Patent number: 4029737
    Abstract: This invention relates to a method for recovering aluminum hydroxide from alunite ore by roasting the ore to remove water of hydration, roasting it again in a reducing atmosphere to remove sulfate, roasting a third time in an oxidizing atmosphere to convert any sulfides formed in the second roast, leaching with a weak base, leaching with water to remove potassium and sulfate, extracting the aluminum content with a mixture of sodium hydroxide and potassium hydroxide, removing contaminant silica from the leach solution, and precipitating aluminum hydroxide by cooling and seeding the solution.
    Type: Grant
    Filed: April 9, 1976
    Date of Patent: June 14, 1977
    Assignees: Southwire Company, National Steel Corporation, Earth Sciences, Inc.
    Inventors: Douglas Stevens, Helge O. Forberg, Larry D. Jennings, David L. Thompson, Julian V. Copenhaver