Patents by Inventor Herbert K. Wurster

Herbert K. Wurster 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).

  • Photoconductive devices containing squarilium dye compositions
    Patent number: 4833053
    Abstract: Novel squaric acid methine dyes are provided. These dyes are useful in forming photoconductive layers for components utilized in electrographic imaging processes.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: May 23, 1989
    Assignee: Ricoh Corporation
    Inventor: Herbert K. Wurster
  • Sensitive electrophotographic plates containing squaric acid methine dyes suspended in a binder
    Patent number: 4500621
    Abstract: Electrographic imaging process and electrographic plates utilized therein are provided wherein the photoconductive layer comprises a squaric acid methine dye admixed with a binder or a photoconductive material. The photoconductive layer may also comprise the squaric acid methine dye, a binder and a charge transport material.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: February 19, 1985
    Assignee: Ricoh Systems, Inc.
    Inventor: Herbert K. Wurster
  • Photoreceptor containing squaric acid methine dyes
    Patent number: 4481270
    Abstract: An electrophotographic imaging process having a double charging sequence and a photoreceptor utilized therein are provided, wherein the photoreceptor comprises a substrate, a photosensitive layer comprising a squaric acid methine dye, and an insulating layer. The photosensitive layer may also comprise a squaric acid methine dye and a charge transport material.
    Type: Grant
    Filed: April 28, 1983
    Date of Patent: November 6, 1984
    Assignee: Ricoh Systems, Inc.
    Inventors: Tomio Kubota, Herbert K. Wurster