Patents Assigned to MicroTouch Systems, Inc.
  • Method of and apparatus for sensing the location, such as coordinates, of designated points on an electrically sensitive touch-screen surface
    Patent number: 4806709
    Abstract: A method and apparatus are disclosed for determining the location of a designated point on an electrically sensitive touch-screen surface while minimizing aberrations introduced by non-uniformity in the field applied to the surface, by attaching a plurality of field-producing discrete point electrodes to widely spaced points on the surface in a predetermined geometric pattern and by measuring the currents drawn from the point electrodes upon the capacitive touching of a designated location on the surface.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: February 21, 1989
    Assignee: Microtouch Systems, Inc.
    Inventor: Blair Evans