Patents by Inventor Karl H. Krivanec

Karl H. Krivanec 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 the production or recovery of acids from metalliferous solutions of such acids
    Patent number: 5149515
    Abstract: During the pickling, etching, chemical shaping etc. of steels, stainless steels, special alloys and special metals and the dissolution of those metals, metalliferous solutions of the acids employed arise in the course of such processes which must either be disposed of by neutralization or be used for the recovery of the acids and metals by expensive processes. According to the invention the production or recovery of nitric acid or a mixture of nitric acid and hydrofluoric acid takes place by spray-roasting the solutions at temperatures of 200.degree. to 500.degree. in a reactor (1) and subsequent absorptions or condensation of the gases generated in column means (7, 8) at temperatures of 0.degree. to 70.degree. C.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: September 22, 1992
    Assignee: Maschinenfabrik Andritz Actiengesellschaft
    Inventors: Wilhelm Karner, Dieter Wurmbauer, Karl H. Krivanec, Juanito Horn