Patents by Inventor Wilhelm Bronner

Wilhelm Bronner 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 cleaning spinnerets
    Patent number: 4200471
    Abstract: For the smooth production of filaments from polyesters it is very important to use accurately cleaned polymers and also accurately cleaned spinnerets. For removing remainders of polyesters from the spinneret a mixture consisting of at least 70 percent by weight of tri-, tetra-, penta- and hexaethyleneglycol and from 2 up to 10 percent by weight mono- and/or diethyleneglycol and up to 20 percent by weight of hepta-, octa- and higher ethyleneglycols has proved to give best results. Zinc acetate may be added for the solving process.
    Type: Grant
    Filed: December 20, 1977
    Date of Patent: April 29, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wolfgang Burghardt, Wilhelm Bronner