Patents by Inventor Joseph J. Zdrodowski

Joseph J. Zdrodowski 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).

  • Time division flow control
    Patent number: 4162689
    Abstract: Calibrated control of the duty cycle of fast acting pulse valves provides highly accurate control of fluid flow through the valve. While the flow is precisely controllable, it is not directly proportional to the duty cycle and thus a calibration curve is needed for each valve.
    Type: Grant
    Filed: July 14, 1977
    Date of Patent: July 31, 1979
    Assignee: Hoffmann-La Roche Inc.
    Inventor: Joseph J. Zdrodowski