Patents by Inventor Keith H. Hill

Keith H. Hill 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).

  • Optoelectric ripple carry adder
    Patent number: 5045681
    Abstract: The invention comprises a semiconductor substrate with a plurality of photoconductive elements. The photoconductive elements are connected to form a combinational logic ripple carry adder having only AND and OR logic gates. An optic substrate overlies the semiconductor substrate and directs light representing logic parameters onto the logic gates. The ripple carry adder has complementary inputs and complementary outputs to enable the use of only AND and OR gates.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: September 3, 1991
    Assignee: The Boeing Company
    Inventors: Steven E. Elrod, R. Aaron Falk, Keith H. Hill