Patents by Inventor Ernst Puchel

Ernst Puchel 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).

  • Process for preparing foamed gypsum and constructional elements composed thereof
    Patent number: 4153470
    Abstract: Foamed gypsum is produced by mixing gypsum with water in the presence of additives serving for liquefying the gypsum and for adjusting the starting period, and by adding thereto a mixture of isocyanate compounds and polyurethane preadducts.After a starting period of about five minutes a foaming process occurs, which is completed after about 20 minutes and furnishes a foamed gypsum after setting. The foamed gypsum has a density from 0.45 to 0.8 g/cc, whereas unfoamed gypsum has a density of 1.66 g/cc.The process may be performed in special molds, so that after setting specially formed elements are obtained, e.g. sandwich elements.
    Type: Grant
    Filed: May 18, 1978
    Date of Patent: May 8, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Dieter Stahl, Ernst Puchel