Patents by Inventor Edward F. Pressley

Edward F. Pressley 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 for manufacturing bipolar transistors
    Patent number: 8298901
    Abstract: An improved method for manufacturing bipolar transistors is disclosed. The method for forming a PNP transistor comprises the steps of forming a P type collector on a substrate, forming a PNP epitaxial base on the P type collector, forming a PNP extrinsic base in the PNP epitaxial base, and forming a PNP emitter in contact with the PNP extrinsic base. The method for forming an NPN transistor comprises the steps of forming an N type collector on a substrate, forming a NPN epitaxial base on the N type collector, forming an NPN extrinsic base in the NPN epitaxial base, and forming an NPN emitter in contact with the NPN extrinsic base. The PNP and NPN transistors may be manufactured in the same control flow process.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: October 30, 2012
    Assignee: National Semiconductor Corporation
    Inventors: Richard W. Foote, Edward F. Pressley, Joseph A. DeSantis, Alexei Sadovnikov, Christoher J. Knorr