Patents by Inventor Tadeusz Grzywaczewski

Tadeusz Grzywaczewski 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).

  • Method of manufacturing barium sulphide
    Patent number: 4795625
    Abstract: The invention relates to a method of manufacturing barium sulphide from barites or barium sulphate. The method of manufacturing barium sulphide as per this present invention involves using finely divided calcium carbide for the reduction at a temperature above 873 K. It is preferred to use carbide mixed with coke. It is also preferred to use an addition of borax to carbide or carbide coke mixture.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: January 3, 1989
    Assignee: Politechnika Slaska im. Wincentego Pstrowskiego
    Inventors: Marian Starczewski, Maria Switonska-Oskedra, Tadeusz Grzywaczewski, Hubert Pisarski, Stanislaw Gazda, Genowefa Sybilska