Patents by Inventor Wilhelm Volkenborn

Wilhelm Volkenborn 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).

  • Filling cavities in mining
    Patent number: 4786211
    Abstract: Cavities in mining are filled by introducing a mixture consisting of a slurry or sludge which evolves CO.sub.2, foams and solidifies and predominantly comprises alpha-hemihydrate, alpha-CaSO.sub.4. 0.5 H.sub.2 O, an alkali metal or alkaline earth metal carbonate and water, by a method in which the mixture is mixed with a bisulfate-containing aqueous solution or suspension of one or more metals before being introduced into the cavities to be filled.
    Type: Grant
    Filed: August 6, 1987
    Date of Patent: November 22, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernd Leutner, Berthold Mueller, Wilhelm Volkenborn