Indexing overlay for video display devices

Claim 1

A computer video display overlay for detachable electrostatic adhering to the face of a video display for indexing a predetermined number of columns and rows of positions corresponding to a predetermined number of columns and rows, respectively on the display, for allowing visual detection of the display through the overlay and comprising, in combination: a body member comprising a flexible, transparent electrostatic charge accepting sheet, said sheet being at least a preselected number of display columns wide and a preselected number of display rows high, and said sheet having a first surface and a second surface and a preselected thickness therebetween for detachable electrostatic attachment to the face of the video display, and said first surface of said sheet contiguous the face of the video display for said electrostatic attachment thereto; a plurality of first indicia on said first surface of said sheet and visually detectable through said sheet from regions spaced external from said second surface of said sheet, and said first indicia comprising parallel rows in a first spaced array, each of said rows comprised of a plurality of spaced apart dashes, extending a preselected distance in the width of said sheet, each of said dashes of said first indicia in each row in aligned relationship with the other dashes in said row, and readable against the background of underlying symbols on the computer video display, one of said dashes of said first indicia placed at each of the displayable columnar positions in each of said rows; a plurality of second indicia on said first surface of said sheet and visually detectable through said sheet from regions spaced external said second surface of said sheet, said second indicia comprising substantially parallel columns in a second spaced array of dashes extending a preselected distance in the height of said sheet, each of said dashes of said second indicia in each column in the spaced array and in alignment with each of the other dashes in said column and readable against the background of underlying symbols on the computer video display, said second indicia extending substantially perpendicularly to said rows of said first indicia, and said second indicia spaced apart and placed substantially coextensive with said first indicia, a first of said second indicia at a preselected columnar position in each of said rows of said first indicia, the combination of said first and second indicia being perceivable by the user as different from said first indicia alone; said first spaced array and second spaced array defining first, second, third, and fourth margins between said first and second indicia, and each of the four edges of said sheet; a plurality of first labeling indicia on said first surface of said sheet in a first of said margins and visually detectable through said sheet from regions spaced external said second surface, and readable against the background of underlying symbols on the computer video display, said first labeling indicia comprising numeric indicia of cumulatively numbering said first indicia and placed adjacent each column of said second indicia, whereby the user can detachably attach said sheet by electrostatic attraction to the face of said computer video display to index preselected displayable positions on the computer video display by row and column number; and said second face of said sheet erasably markable upon by preselected instruments.