Patents by Inventor John D. Halm

John D. Halm 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).

  • Substrate smoothed by coating with gypsum-containing composition and method of making
    Patent number: 6740395
    Abstract: A rough-surfaced substrate, such as a fiberboard, is provided with a smoother surface by applying a coating comprising calcium sulfate hemihydrate which has been prevented from hydrating to gypsum by set preventer, and which sets when brought into contact with a set initiator, e.g. aluminum sulfate, preferably present on the surface of the substrate.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: May 25, 2004
    Assignee: United States Gypsum Company
    Inventors: John D. Halm, Aida L. Carbo, Michael R. Lynn, Richard B. Stevens, Charles J. Miller, Peter M. Attard, Therese A. Fults
  • Substrate smoothed by coating with gypsum-containing composition and method of making
    Publication number: 20030134554
    Abstract: A rough-surfaced substrate, such as a fiberboard, is provided with a smoother surface by applying a coating comprising calcium sulfate hemihydrate which has been prevented from hydrating to gypsum by set preventer, and which sets when brought into contact with a set initiator, e.g. aluminum sulfate, preferably present on the surface of the substrate.
    Type: Application
    Filed: December 21, 2001
    Publication date: July 17, 2003
    Inventors: John D. Halm, Aida L. Carbo, Michael R. Lynn, Richard B. Stevens, Charles J. Miller, Peter M. Attard, Therese A. Fults