Patents by Inventor Helmut Saffran

Helmut Saffran 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 thermal treatment of crude phthalic acid
    Patent number: 4055577
    Abstract: There is disclosed a process and apparatus for the thermal treatment of crude phthalic anhydride. The process is conducted in a system with an inner chamber and outer chamber positioned therearound and the chambers have a common wall. The outer chamber may be divided into a plurality of sub-chambers and the flow of the phthalic anhydride undergoing treatment may be substantially reversed in successive ones of the sub-chambers. The system provides for more efficient use of heat and equipment.
    Type: Grant
    Filed: November 11, 1974
    Date of Patent: October 25, 1977
    Assignee: Davy Powergas GmbH
    Inventors: Helmut Saffran, Lothar Sterck