Patents by Inventor David C. Ingram

David C. Ingram 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).

  • Amorphous, hydrogenated carbon (a-C:H) photovoltaic cell
    Patent number: 5562781
    Abstract: A photovoltaic cell comprising a plurality of film layers, at least one of the layers being a semiconductor film of amorphous, hydrogenated carbon. The preferred embodiment comprises a plurality of semiconductor films sandwiched together in layers, every three layers forming a PIN junction. All films are made of amorphous, hydrogenated carbon and vary only by dopant levels within each PIN junction. There are variations in bandgap from one PIN junction to the next in order that the photovoltaic effect in each PIN junction will be caused by a different portion of the spectrum of light.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: October 8, 1996
    Assignee: Ohio University
    Inventors: David C. Ingram, Michael Maldei