Patents by Inventor Wilhelm Kallert

Wilhelm Kallert 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).

  • Heterogeneous systems of polyol/diphenyl methane uret dione diisocyanates and a process for their production
    Patent number: 4442280
    Abstract: Storage stable heterogeneous systems which may be processed at low temperatures to form polyurethanes are made by mixing a specific quantity of a high molecular weight polyhydroxyl compound with a specified quantity of a 4,4'-diphenyl methane uret dione diisocyanate corresponding to a specified formula or a corresponding modified diisocyanate. A lead and/or tin catalyst is also included.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: April 10, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Grogler, Wilhelm Kallert
  • Activated isocyanate prepolymers and a process for the production of elastomeric polyurethane resins
    Patent number: 4330656
    Abstract: This invention relates to isocyanate prepolymers activated with alkyl ureas and to a two-stage process for the production of polyurethane elastomers based on 1,5-naphthylene diisocyanate, using alkyl ureas as activators.
    Type: Grant
    Filed: October 4, 1979
    Date of Patent: May 18, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Grogler, Wilhelm Kallert