Patents by Inventor Karl Kirchmayr

Karl Kirchmayr 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).

  • Mixture for manufacture of shaped elements and its use
    Patent number: 4797161
    Abstract: The mixture for manufacture of shaped elements of fiber-cement, in addition to minimum 5% by weight of pozzuolanic silicic acid contains also an amount of limestone powder. With this mixture it is possible to obtain a product of high strength properties without tendency to embrittlement respectively to formation of cracks on the surface.In utilizing the mixture for manufacture of shaped elements the latter are moulded from a mixture of aqueous material and permitted to set at 70.degree. to 90.degree. C. during 5 to 12 hours preferably with simultaneous compression.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: January 10, 1989
    Assignee: Ametex AG
    Inventors: Karl Kirchmayr, Hans-Jurgen Miko, Bruno Watzka, Josef Studinka, Carl Schmitt-Henco