Patents by Inventor Walter P. Heil

Walter P. Heil 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).

  • Patent number: 4123270
    Abstract: This invention relates to a method of making an electrophotographic imaging element, the resulting element, and the process of utilizing the element in electrophotographic processes. In its present form the element is generally of the known multi-layered type including a conductive substrate, a layer of charge generating photoconductive material, and a charge transport layer. The charge generating photoconductive layer requires no binder matrix and is comprised primarily of an organic dye material selected from organic primary amine soluble charge generating monoazo and disazo compounds and from organic primary amine soluble charge generating derivatives of squaric acid.
    Type: Grant
    Filed: January 12, 1976
    Date of Patent: October 31, 1978
    Assignee: International Business Machines Corporation
    Inventors: Walter P. Heil, David B. Sclove