Patents by Inventor Elzie H. Freeman

Elzie H. Freeman 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).

  • Coarse/fine digital pattern combiner for high accuracy
    Patent number: 4377807
    Abstract: A rotary shaft position measurement system using digital position detectors roviding coarse and fine binary word readouts having four overlapping bits all of which are having subtractively compared to provide command signals that are used to correct the non-overlapping portion of the coarse word prior to combining with the fine word. The comparator utilizes a binary four bit full adder in combination with coarse word input inversion, and direct and inverted application of the carryout and .SIGMA.4 outputs to first and second AND gates to generate coarse word correction commands.
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: March 22, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Elzie H. Freeman