With Liquid Contact Patents (Class 338/156)
  • Patent number: 5554965
    Abstract: The present invention provides a lubricated variable resistance control including a substrate having formed thereon an electrical resistance path and an electrical conductive path, and a movable contact electrically bridging the electrical resistance path and the electrical conductive path. Disposed along the electrical conductive path is a non-conductive lubricant material. The electrical conductive path includes one or more protruding ridges spaced along one surface of the electrical resistance path. The ridges are formed of an electrically resistive material and they serve to help insure that the control device does not suffer from current interruptions.
    Type: Grant
    Filed: November 2, 1994
    Date of Patent: September 10, 1996
    Assignee: The Erie Ceramic Arts Company
    Inventor: Craig C. Sundberg
  • Patent number: 4107642
    Abstract: A joystick comprising a control handle within which is located an inclination sensitive potentiometer. The potentiometer includes an elongate resistance element and an electrically conductive liquid wiper. Movement of the potentiometer causes the wiper to flow along the resistance element and to vary the output resistance of the potentiometer.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: August 15, 1978
    Assignee: Atari, Inc.
    Inventor: James G. Crummett