Patents by Inventor Klaus-Dieter Sommerfeld

Klaus-Dieter Sommerfeld 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).

  • Use of 1,1,1,4,4,4-hexaefluorobutane as a blowing and insulating gas for the production of foam plastics
    Patent number: 4931482
    Abstract: This invention relates to an improved method of preparing closed cell foams using 1,1,1,4,4,4-hexafluorobutane as a blowing agent and insulating gas in the production of such foams, including isocyanate-based foams such as polyurethane foams and polyisocyanurate foams.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: June 5, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilhelm Lamberts, Klaus-Dieter Sommerfeld, Dietmar Bielefeldt, Albrecht Marhold, Michael Negele