Patents by Inventor Harry M. Macksey

Harry M. Macksey 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: 4616400
    Abstract: Using a process constructed in accordance with the teachings of this invention, a double recess, N+ ledge field effect transistor may be formed using a single masking step. Two layers of photoresist of differing types are formed on the surface of an N+ epitaxial layer. On the surface of these photoresist layers a layer of material which may be etched by reactive ion etching with freon but will not etch by reactive ion etching with oxygen is formed. A gate pattern is etched into this surface layer of material and the photoresist layers are selectively undercut to provide a pattern to etch the gate recess and the wide recess. A gate contact is then formed by perpendicular evaporation through the gate pattern in the surface layer of material. Thus the invention provides a process for forming a self-aligned double recess transistor using a single mask to form the gate, the wide recess and the gate recess, and another mask to form the source and drain contacts.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: October 14, 1986
    Assignee: Texas Instruments Incorporated
    Inventors: Harry M. Macksey, Rick D. Hudgens