Patents by Inventor Jack A. Tiethof

Jack A. Tiethof 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).

  • Sorptive clay composition and method of manufacture
    Patent number: 4339352
    Abstract: A novel sorptive clay product is formed by treating attapulgite clay with sodium silicate and heating to expel moisture such that the product contains about 7-20% total volatile matter. Acid may also be added such that the pH of aqueous slurry is in the range 5 to 10. This sorptive clay product exhibits water and oil absorption and resistance to wet breakdown equivalent to higher-temperature activated attapulgite products.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: July 13, 1982
    Assignee: Engelhard Minerals & Chemicals Corporation
    Inventors: Frank Pitts, Jack A. Tiethof, Robert A. Burns
  • Hydrosulfite preparation
    Patent number: 4157980
    Abstract: Aluminum metal is activated with hydrochloric acid and then reacted with an aqueous solution of sulfur dioxide to produce an aluminum hydrosulfite (dithionite) liquor useful for bleaching materials such as clay. The aluminum hydrosulfite can be converted to a sodium hydrosulfite liquor by precipitating aluminum with a sodium base.
    Type: Grant
    Filed: April 14, 1978
    Date of Patent: June 12, 1979
    Assignee: Engelhard Minerals & Chemicals Corporation
    Inventor: Jack A. Tiethof
  • Hydrosulfite production
    Patent number: 4076795
    Abstract: An improved method for producing iron hydrosulfite liquor by reduction of sulfur dioxide with metallic iron is disclosed. Also disclosed are improvements in the conversion of the iron hydrosulfite liquor to produce sodium hydrosulfite bleach liquors.
    Type: Grant
    Filed: September 9, 1976
    Date of Patent: February 28, 1978
    Assignee: Engelhard Minerals & Chemicals Corporation
    Inventor: Jack A. Tiethof