Patents by Inventor Ulrich Wetzig

Ulrich Wetzig 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 continuous control of the cell number of polyurethane foams
    Patent number: 5296517
    Abstract: The process for continuous control of cell number in the production of polyurethane foams from polyols, isocyanates and water, where mixing the components is effected in a mixing head with adjustable injection pressure and adjustable mixing chamber pressure, consists in that immediately prior to entering the mixing head the gas content of the isocyanate is continuously increased or reduced.
    Type: Grant
    Filed: April 5, 1993
    Date of Patent: March 22, 1994
    Assignee: Koepp Aktiengesellschaft
    Inventors: Ulrich Wetzig, Manfred Hohenhorst