Patents by Inventor William R. Stern

William R. Stern 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 recovering gallium
    Patent number: 4193968
    Abstract: The invention provides a process for recovering gallium from calcined clay leached with hydrochloric acid. The leach solution containing aluminum, ferric and gallium chlorides is treated by ion exchange to first remove aluminum ions, following which the solution containing ferric and gallium chlorides is treated to reduce the ferric ions to ferrous ions. The reduced solution is acidified with hydrochloric acid sufficiently to insure that the gallium is present in the form GaCl.sub.4 - ions, and is then again treated by ion exchange to separate the ferrous ions from the gallium for ultimate recovery of the latter.
    Type: Grant
    Filed: October 3, 1978
    Date of Patent: March 18, 1980
    Assignee: The Anaconda Company
    Inventors: Robert E. Sullivan, William R. Stern, Bess L. Vance