Patents by Inventor Klaus-Dieter Gerber

Klaus-Dieter Gerber 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 producing paper and cardboard
    Patent number: 6132558
    Abstract: Paper and cardboard are produced by draining pulps, with sheet formation and drying of the sheets, by a process in which first(a) polyethyleneimines having a molar mass M.sub.w of more than 500,000 or polymers containing vinylamine units and having a molar mass of from 5000 to 3 million and then(b) cationic polyacrylamides or polymers containing vinylamine units, the molar masses M.sub.w of the polymers each being at least 4 million,are added to the pulps, and the pulp is then subjected to at least one shearing stage and is flocculated by adding bentonite, colloidal silica or clay.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: October 17, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Rainer Dyllick-Brenzinger, Hubert Meixner, Friedrich Linhart, Dietmar Monch, Klaus-Dieter Gerber, Bernd Dirks, Peter Baumann