Patents by Inventor Adolf Howald

Adolf Howald 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 removal of impurities from aluminum melts
    Patent number: 4144054
    Abstract: The process for removing impurities, in particular for removing sodium chloride from aluminum melts, employs reactive chlorine which is introduced into the melt and then passes with the melt through a filter bed. Aluminum chloride formed by the reaction of the chlorine with the melt is chemisorbed on the chloride or group of alkali or alkali earth chlorides in the filter and the sodium in solution in the melt is in turn chemisorbed on the aluminum chloride thus reducing the sodium content of the melt.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: March 13, 1979
    Assignee: Swiss Aluminium Ltd.
    Inventors: Rudolf Stary, Adolf Howald