Patents by Inventor Fritz E. Krueckau

Fritz E. Krueckau 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).

  • Expansion of shrunk foam particles of propylene polymers
    Patent number: 5045256
    Abstract: Foam particles of propylene polymers which have shrunk from 40 to 95% of their original volume and have a bulk density of from 10 to 30 g/1 can be expanded if they are treated with air or nitrogen under superatmospheric pressure, subsequently decompressed. If desired post-foamed by heating and, after aging, re-treated with air or nitrogen under superatmospheric pressure, subsequently decompressed and aged under atmospheric pressure until the pressure in the cells has dissipated.
    Type: Grant
    Filed: July 6, 1990
    Date of Patent: September 3, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Isidoor De Grave, Udo Haardt, Wolfram Koegel, Fritz E. Krueckau, Hermann Tatzel