Patents Represented by Attorney Sam Kurlandsky

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  • Process for purifying phosphogypsum
    Patent number: 4421731
    Abstract: A process for reducing radioactive contamination of phosphogypsum. Phosphogypsum containing radioactive material is calcined to form hemihydrate crystals carrying the radioactive contaminants, and a portion of the crystals is converted to substantially radiation-free gypsum crystals which are readily separated from the hemihydrate crystal relics containing substantially all of the radioactive contamination.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: December 20, 1983
    Assignee: United States Gypsum Company
    Inventors: Jay W. Palmer, John C. Gaynor