Patents by Inventor Richard L. Wilkes, Jr.

Richard L. Wilkes, Jr. 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).

  • Reducing turbidity in chromic acid solutions
    Patent number: 5034211
    Abstract: Disclosed is a method of reducing the turbidity of an aqueous solution of chromic acid which is formed by dissolving melted chromic anhydride in water. The chromic anhydride is contacted with water in an amount in excess of 0.02 wt %, but insufficient to form a solution, at a temperature above ambient but below about 196.degree. C. The water may be in the form of a liquid, water vapor, or steam. When the chromic anhydride is subsequently dissolved in water, the solution is much less turbid than it otherwise would be.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: July 23, 1991
    Assignee: Occidental Chemical Corporation
    Inventors: Robert L. Zeller, III, Russell J. Morgan, Gilbert D. Rabbe, Donna R. Fiscus, Richard L. Wilkes, Jr.