Patents by Inventor Simbert W. Maier

Simbert W. Maier 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).

  • Gypsum products
    Patent number: 4140536
    Abstract: This invention relates to a method of making a gypsum product wherein a hot homogeneous mixture of pitch and a suitable organic material are mixed with gypsum and water to form a slurry. This slurry is then formed, allowed to set and then heated to a temperature above the melting points of both constituents of the mixture but below the temperature at which there is any significant deterioration of the product.
    Type: Grant
    Filed: March 1, 1978
    Date of Patent: February 20, 1979
    Assignee: Gypsum Industries Limited
    Inventors: Simbert W. Maier, Adriaan J. H. Lamprecht