Patents by Inventor Harald Dauns

Harald Dauns 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).

  • Catalytic, solid state process for the preparation of linear polyamides
    Patent number: 5128442
    Abstract: A process for the preparation of a linear polyamide by reacting the appropriate dicarboxylic acid and diamine in a liquid reaction medium with the addition of a catalytically effective phosphorus compound, removing the reaction medium to give a solid salt, precondensing the latter in the solid phase at a temperature of from 140.degree. C. to 5.degree. C. below the melting point of the salt and continuing condensation at a temperature above that used for the precondensation until the desired degree of condensation is reached.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: July 7, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Wolfgang F. Mueller, Harald Dauns