Patents by Inventor David N. Wallace

David N. Wallace 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).

  • Method for the preparation of modified synthetic hydrotalcite
    Patent number: 5075087
    Abstract: A phosphate-containing synthetic hydrotalcite of the following empirical formula:xMgO.Al.sub.2 O.sub.3.yPO.sub.4.zH.sub.2 Owherein, x, y and z are integers indicating the number of moles present of MgO, PO.sub.4 and H.sub.2 O, respectively. The phosphate-containing hydrotalcite being prepared by the addition of sufficient phosphoric acid to the reaction mixture to liberate carbon dioxide. The phosphate-containing hydrotalcite improves the flame retardant characteristics by providing char promotion to the system.
    Type: Grant
    Filed: October 5, 1989
    Date of Patent: December 24, 1991
    Assignee: J. M. Huber Corporation
    Inventors: John A. Kosin, Barry W. Preston, David N. Wallace
  • Modified synthetic hydrotalcite
    Patent number: 4883533
    Abstract: A phosphate-containing synthetic hydrotalcite of the following empirical formula:xMgO.multidot.Al.sub.2 O.sub.3 .multidot.yPO.sub.4 .multidot.zH.sub.2 Owherein, x, y and z are integers indicating the number of moles present of MgO, PO.sub.4 and H.sub.2 O, respectively. The phosphate-containing hydrotalcite being prepared by the addition of sufficient phosphoric acid to the reaction mixture to liberate carbon dioxide. The phosphate-containing hydrotalcite improves the flame retardant characteristics by providing char promotion to the system.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: November 28, 1989
    Assignee: J. M. Huber Corporation
    Inventors: John A. Kosin, Barry W. Preston, David N. Wallace