Patents by Inventor Richard J. Tree

Richard J. Tree 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).

  • Method of manufacturing a DMOS device
    Patent number: 4904613
    Abstract: A method of manufacturing a semiconductor device in which a conductive layer (6) provided on a surface (4) of a semiconductor body (1) is formed with at least one opening (10). The semiconductor device may be an insulated gate field effect transistor (IGFET) in which case the opening (10) defines a hollow gate structure for the IGFET. Insulating material (16') is grown on the surface (4) to cover the conductive layer.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: February 27, 1990
    Assignee: U.S. Philips Corporation
    Inventors: David J. Coe, Kenneth Whight, Richard J. Tree