Patents by Inventor Wolfgang Arhelger

Wolfgang Arhelger 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).

  • Asbestos-free building material plates and method of making same
    Patent number: 4808229
    Abstract: A building material plate formed by compression in the hydration-water moist state and having quality features resembling asbestos-reinforced cement and made of an asbestos-free material mixture having up to 30 vol. % of cellulose fiber proportions in the high-packed state of a diameter spectrum D.sub.C, singly bound into a hydration binder particle mixture still present in the moist forming state of a grain size-main distribution spectrum D.sub.o within the ratio range0.9.ltoreq.D.sub.C /D.sub.o .ltoreq.1.1,which in case of a participation of cement in the binder contains special additives showing a pozzuolana reaction for securing constancy in longterm quality.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: February 28, 1989
    Assignee: Baierl & Demmelhuber GmbH & Co. Akustik & Trockenbau KG
    Inventor: Wolfgang Arhelger