Patents by Inventor Harmut Nefzger

Harmut Nefzger 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 the production of stable polymers
    Publication number: 20080108776
    Abstract: Stable NCO prepolymers are produced from polyisocyanates having a melting point greater than 70° C., preferably, naphthalene diisocyanate, having advantageous physical properties. An important feature of the process of the present invention is the rapid cooling of the prepolymer. The process of the present invention may be carried out on a continuous or batch basis. The prepolymers of the present invention are particularly suitable for the production of cast polyurethane elastomers.
    Type: Application
    Filed: November 2, 2006
    Publication date: May 8, 2008
    Inventors: James Michael Barnes, Harmut Nefzger, Erika Bauer, Stefan Penninger, Thomas Schutz, Heinrich Lutz, Horst Mews, Charles S. Gracik