Patents Represented by Attorney K. E. Roberts

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  • Plaster consistency reducer
    Patent number: 4237260
    Abstract: An additive for reducing the amount of water necessary in forming a pourable aqueous calcined gypsum slurry, the additive comprising a high potassium salt of a condensation product of naphthalene and sulfonic acid having a molecular weight between about 300 and 3,000. Aqueous plaster slurries containing the additive are pourable, moldable and castable with much less excess water than ordinarily required, resulting in dried cast products of increased strength and other physical property benefits.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: December 2, 1980
    Assignee: United States Gypsum Company
    Inventors: Robert G. Lange, Harley L. Schlotthauer