Patents by Inventor Alan L. Koelling

Alan L. Koelling 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).

  • Gradient layer panchromatic photoreceptor
    Patent number: 4710442
    Abstract: An arsenic-selenium photoreceptor is provided wherein said photoreceptor is characterized by a gradient concentration of arsenic increasing from the bottom surface to the top surface of the photoreceptor such that the arsenic concentration is about 5 wt. % at a depth of about 5 to 10 microns from the top surface of the photoreceptor and is about 30 to 40 wt. % at the top surface of the photoreceptor.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: December 1, 1987
    Assignee: Ricoh Systems, Inc.
    Inventors: Alan L. Koelling, William J. Murphy, Edward F. Mayer