Patents by Inventor Marvin H. Schilt

Marvin H. Schilt 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).

  • Process control system that controls its outputs according to the results of successive analysis of the vertical input columns of a hypothetical ladder diagram
    Patent number: 4217658
    Abstract: A process control system for controlling a set of outputs according to a multiplicity of inputs. The process control system analyzes the condition of the inputs as though they were arranged in a hypothetical ladder diagram which is a representation of the circuitry that would be required to control the loads if simple switches were interconnected, by wires, in the conventional way to control the loads. The hypothetical ladder diagram includes a plurality of hypothetical horizontal rows of circuit elements in which the circuit elements are also located in hypothetical vertical columns. All of the hypothetical vertical columns, except the last, are "input" vertical columns since they represent input circuit elements. The last vertical column contains the loads (or outputs) and is an "output" vertical column.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: August 12, 1980
    Assignee: Struthers-Dunn, Inc.
    Inventors: Donald E. Henry, Thomas A. Murrell, Marvin H. Schilt, Alfred C. Weaver