Patents Represented by Attorney Ernest C. Posner

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  • Process for surface modified hollow microspheres
    Patent number: 4411847
    Abstract: Non-fused hollow glass microspheres that consist primarily of silicate are rendered more water-resistant by treatment with multivalent metals. The hollow microspheres are slurried with water and then a solution of a multivalent metal salt such as Al.sub.2 (SO.sub.4).sub.3 is added to the slurry. The rate of the addition is controlled so that the pH can be regulated. Separating, washing and drying complete the preparation.
    Type: Grant
    Filed: May 27, 1982
    Date of Patent: October 25, 1983
    Assignee: PQ Corporation
    Inventors: David I. Netting, Bruce D. Spivack, James P. Cunnion, Jr.