Patents by Inventor Robert Ostertog

Robert Ostertog 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).

  • Cement composition
    Patent number: 6475275
    Abstract: A cement composition contains 35-85% by weight of a cement, 3-15% by weight of a clay, 1-50% by weight of an aggregate and/or a fibrous material, and 0.2-5% by weight of a high efficiency retarder. A benefit of the present invention is that equipment used to apply cement compositions need not be cleaned every night when used on a construction site.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: November 5, 2002
    Assignee: Isolatek International
    Inventors: Edward Nebesnak, Robert Ostertog