Patents by Inventor Dennis D. Johnson

Dennis D. Johnson 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).

  • Direct drive servovalve with rotary valve
    Patent number: 4800924
    Abstract: An electrical force motor and servovalve combination has a rotary spool directly coupled to the motor shaft without requiring a rotary-to-linear motion convertor; the rotary spool is configured to have a cruciform metering section that cooperates with a flow sleeve having ports and slots configured to produce four-way flow patterns in a reduced length and volume valve package.
    Type: Grant
    Filed: April 24, 1987
    Date of Patent: January 31, 1989
    Assignee: Davidson Textron Inc.
    Inventor: Dennis D. Johnson