Patents by Inventor Helmet H. Frohlich

Helmet H. Frohlich 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).

  • Image transfer layers
    Patent number: 5372910
    Abstract: A process for preparing images on a tonable, light-sensitive layer using a transfer layer containing at least 20 percent by weight of a toner and a polymer with a maximum tensile strength of at least 2 N/mm.sup.2 as a binder. The pigmented transfer layers can be used in color proofing processes requiring high resolution, reproducible color density and low dot gain.
    Type: Grant
    Filed: November 3, 1993
    Date of Patent: December 13, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bernhard Metzger, Helmet H. Frohlich