Patents by Inventor Robert C. C. Chang

Robert C. C. Chang 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).

  • Hybrid fluidic and fluid servo controller
    Patent number: 3986526
    Abstract: A train of fluid pulses representative of a process variable is processed by digital fluidic circuits and is then converted into an analog fluid pressure signal which is compared to an analog command signal, the difference between the two compared signals being caused to appear in the form of a displacement. This displacement is amplified by means of a fluid servo system, the amplified output of which is utilized for directly driving a control element for a process.
    Type: Grant
    Filed: June 14, 1974
    Date of Patent: October 19, 1976
    Assignee: Sun Oil Company of Pennsylvania
    Inventors: Robert C. C. Chang, William M. Scott