Patents by Inventor Bruce K. Menzies

Bruce K. Menzies 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).

  • Pressure source
    Patent number: 4566868
    Abstract: A liquid pressure source, e.g. for use in soil mechanics laboratories, has a piston-cylinder unit driven by a stepper motor: a pressure transducer indicates the liquid pressure and a digital feedback control unit responds to generate stepping pulses to maintain a desired pressure. A step counter can be included to provide an accurate indication of volume change, and backlash compensation may be provided by arranging that the counter, following a direction change, ignores motor steps until a pressure change occurs.
    Type: Grant
    Filed: September 11, 1981
    Date of Patent: January 28, 1986
    Assignee: Geotechnical Digital Systems Limited
    Inventor: Bruce K. Menzies