Patents by Inventor Alfred Sandri

Alfred Sandri 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).

  • Reduction of sodium sulfate to sodium sulfide
    Patent number: 4198385
    Abstract: Methods and apparatus pertaining to reduction of sodium sulfate to sodium sulfide include the feeding of sodium sulfate into a combustion chamber in which the sodium sulfate is exposed to a reducing atmosphere while at the same time being exposed also to a temperature above the melting point of sodium sulfide. Thus, a liquid accumulates at the bottom of the combustion chamber and this liquid will of course contain a considerable amount of sodium sulfide reduced from the sodium sulfate.
    Type: Grant
    Filed: September 2, 1977
    Date of Patent: April 15, 1980
    Assignees: Waagner-Biro Aktiengesellschaft, Chemiefaser Lenzing Aktiengesellschaft
    Inventors: Erich Feldbaumer, Heinz Loquenz, Alfred Sandri