1
Alexander M Purcell: Method and apparatus for producing signals corresponding to the position of a cursor. Summagraphics Corporation, Rosen Dainow & Jacobs, November 12, 1991: US05065145 (84 worldwide citation)

A method and apparatus for indicating the position of a cursor on a surface in first and second different directions. The cursor is mounted on a member such as a gantry, and the gantry is guided for movement in the first direction on a carriage. The carriage is mounted for movement in the second dir ...


2
Thomas L Stone: Stylus switch status determination in a digitizer tablet having a cordless stylus. Summagraphics Corporation, Rosen Dainow & Jacobs, November 29, 1994: US05369227 (57 worldwide citation)

A digitizer tablet with a cordless transducer which is capable of providing to the tablet information relating not only to the position of the pointing device but also with respect to the status of any button switches on the transducer. This is obtained by providing a plurality of oscillators, conne ...


3
Alexander M Purcell: Position determining and digitizing method and device. Summagraphics Corporation, Rosen Dainow & Jacobs, March 12, 1991: US04999462 (48 worldwide citation)

A coordinate determining system, tablet, and method wherein the tablet is formed of a sequence of triangular electrodes extending in a first direction, with alternate electrodes having their apexes extending in opposite directions perpendicular to the first direction, and the bases of alternate elec ...


4
Michael J Padula, Henry G Matthews: Digitizer stylus with pressure transducer. Summagraphics Corporation, Rosen Dainow & Jacobs, November 22, 1988: US04786764 (43 worldwide citation)

A stylus switch is activated automatically when the tip of the stylus is pressed against a digitizer tablet with sufficient force. The pressure switch includes a transducer in the form of an ink layer having electrical resistance which varies as a function of the pressure applied thereon. Electrodes ...


5
Michael J Padula, David Siefer, Frank Chiappetta, Tomas Trousil: Pressure sensitive stylus having resiliently compressible tip element. Summagraphics Corporation, Rosen Dainow & Jacobs Liability Partnership, December 3, 1996: US05581052 (36 worldwide citation)

A stylus for use with a digitizer tablet has a tip element that includes a front portion with a tip for engaging the surface of the tablet, and a back portion of the tip element within the stylus housing. The back portion of the tip element is adapted to apply pressure to a pressure sensitive resist ...


6
Robert L Davis, Stephen L Domyan: Position coordinate determination device. Summagraphics Corporation, Daniel M Rosen, March 28, 1978: US04081603 (35 worldwide citation)

A position coordinate determination device wherein data generation lines are displaced from the edges of a data surface, and a sensing device is movably located on the surface. Erroneous detection of data resulting from reflection of signals at the edge of the sheet is inhibited by summing the times ...


7
Edward J Snyder, Stephen L Domyan: Position coordinate determination device. Summagraphics Corporation, Daniel M Rosen, April 19, 1977: US04018989 (33 worldwide citation)

A position coordinate determination device employing duodatum digitizations for each coordinate of a pair of respective coordinates and a ratiometric proportionality calculation for calculating a corrected coordinate digitization value in each measured coordinate.


8
Alfred E Mletzko: Digitizer tablet with user customization of stylus proximity and pressure. Summagraphics Corporation, Rosen Dainow & Jacobs, February 12, 1991: US04992630 (31 worldwide citation)

A digitizer tablet provided with menus over the marginal areas in the non-linear boundaries of the regular electrode array. Coordinate signals from the menu areas are processed to vary a parameter of the processing circuitry for the coordinate value outputs.


9
Henry G Matthews: Method of and apparatus for controlling a display. Summagraphics Corporation, Rosen Dainow & Jacobs, December 27, 1988: US04794388 (31 worldwide citation)

Information presented on a visual display is varied in content and size through the use of a single operator-manipulated input device. The foregoing is accomplished through the use of a novel command signal generator which includes a pivotally mounted rotatable shaft, high-resistance switches operat ...


10
Thomas Zalenski: Electro-optical mouse with improved resolution for compensation of optical distortion. Summagraphics Corporation, Rosen Dainow & Jacobs, August 15, 1989: US04857903 (29 worldwide citation)

An electro-optical mouse has a four-quadrant photodetector, each quadrant producing a voltage proportional to the amount of light impinging thereon. The mouse slides over a surface having optically contrasting, i.e. reflecting and nonreflecting, indicia thereon. The position of the mouse relative to ...