Patents by Inventor Martin Dzidrums

Martin Dzidrums 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).

  • Calcination apparatus
    Patent number: 4915623
    Abstract: The invention concerns an improved method of calcining gypsum in which non-reactive hot gas is passed into contact with the gypsum from a source through a plurality of tubes extending downwardly into the gypsum. The invention also contemplates an improved apparatus which comprises a calcining kettle and a plurality of tubes connected to a common source of non-reactive hot gas and extending downwardly into the kettle and having openings in their lower regions to release the hot gas into the contents of the kettle. The invention provides a method and apparatus which produces gypsum plaster of improved quality and with less insoluble anhydrite.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: April 10, 1990
    Assignee: United States Gypsum Company
    Inventors: David J. Ball, Edward Varney, Philip Curtis, Martin Dzidrums