Patents by Inventor Franco Cappello

Franco Cappello 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 concentrating and purifying aqueous sulphuric acid solutions
    Patent number: 4169054
    Abstract: Concentrated sulphuric acid aqueous solutions, stably clear through the time, are obtained starting from diluted sulphuric acid aqueous solutions containing Mg and possibly other impurities such as Fe, Al, Cr, V and Mn, by evaporation concentration. The process is characterized in that, before filtering, the slurry obtained by evaporation concentration, is cooled down to 10.degree.-25.degree. C. and maintained at this temperature for not less than 12 hours.
    Type: Grant
    Filed: September 20, 1978
    Date of Patent: September 25, 1979
    Assignees: Montedison S.p.A., Escher Wyss Aktiengesellschaft
    Inventors: Franco Cappello, Mario Mortigliengo, Erich Schmoll, Eduard Kratz