Patents by Inventor Ira D. Baxter

Ira D. Baxter 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).

  • Industrial controller with optimized execution of relay ladder logic programs
    Patent number: 5623401
    Abstract: A method of operating an industrial control system converts relay ladder logic programs into flow type programs expressed as `logical gates` connected with `wires` representing variables. This formulation is converted to an efficient code structure in which changes in state of the variables are evaluated and only changes are propagated in evaluating program outputs. The net effect is many steps of evaluation in the control program are avoided during real-time operation of the program connected to controlled equipment.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: April 22, 1997
    Assignee: Allen-Bradley Company, Inc.
    Inventor: Ira D. Baxter