Patents by Inventor Tom C. Kearns

Tom C. Kearns 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).

  • Purification of APT
    Patent number: 4963336
    Abstract: Directed to a process for producing a tungsten product of enhanced purity from ammonium paratungstate (APT) with a minimum number of processing steps which comprises mixing the APT with an ammonium solution, autoclaving the mixture at a temperature above the boiling point thereof to dissolve the APT and recrystallizing APT from the solution to yield an APT product of enhanced marketability.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: October 16, 1990
    Assignee: AMAX Inc.
    Inventors: Leo W. Beckstead, Tom C. Kearns, Eddie C. Chou