Patents by Inventor Ralph Keen

Ralph Keen 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: 4462847
    Abstract: A method for the fabrication of microelectronic semiconductor circuits, including the concurrent low pressure deposition of monocrystalline and polycrystalline semiconductor material in a predetermined pattern. In a preferred embodiment, a dielectric isolated circuit is fabricated, by such selective epitaxial growth, and a subsequent oxidation of both the mono- and polycrystalline deposits. By controlling the ratio of the deposition rates, and by controlling the oxidation step, the poly deposit is substantially fully converted to oxide, while the mono is only partly oxidized, leaving a substantially coplanar, isolated matrix of passivated monocrystalline areas in which to fabricate circuit components for interconnection.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: July 31, 1984
    Assignee: Texas Instruments Incorporated
    Inventors: Stephen W. Thompson, Ralph Keen