1
R David Meadows, Roger J McCoy: Capacitive touch panel system with randomly modulated position measurement signal. Tektronix, John D Winkelman, Mark M Meininger, May 1, 1990: US04922061 (134 worldwide citation)

A capacitive touch panel system (10) having a faceplate (14) with an electrically conductive layer (20) of a consistent resistivity employs a position measurement apparatus (12) to generate an address signal indicative of a position (46) on the faceplate in contact with a stylus (48). The position m ...


2
R David Meadows: Stylus position detection system for optical touch panel. Tektronix, John D Winkelman, Paul S Angello, April 21, 1992: US05107253 (11 worldwide citation)

A detection circuit (30, 32) for carrying out a rapid search technique for locating the position of a stylus (12) relative to a display screen (10). A microprocessor (34) and related components select a group of light detectors (20, 28) that are positioned near the display screen (10). The summed ou ...


3
R David Meadows, David H Price, Joseph H Hubert: Slow display method for digital oscilloscope with fast acquisition system. Tektronix, Boulden G Griffith, May 2, 1995: US05412579 (5 worldwide citation)

The invention is a method for accumulating and displaying digital waveform data, representing the behavior over time of an electrical signal that includes the steps of: repeatedly acquiring and digitizing (10) waveform data during a first set of time intervals, repeatedly acquiring and digitizing (1 ...