Patents by Inventor Kurt Scheel

Kurt Scheel 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).

  • Patent number: 4039616
    Abstract: Calcium sulphate produced by reacting crude phosphate with sulphuric acid is washed with aqueous solutions of condensed and complex aluminium fluorides of the general formulae MeAlF.sub.4, Me.sub.2 AlF.sub.5 and Me.sub.5 Al.sub.3 F.sub.14 as well as AlF.sub.3.nH.sub.2 O, in which Me represents an alkali metal, ammonium or thallium-I ion and n is a number between 1 and 9.
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: August 2, 1977
    Assignee: Gebr. Knauf Westdeutsche Gipswerke
    Inventors: Kurt Scheel, Franz Wirsching