1
Mark J Stefik, J Courtenay Heater: Ultrasound position input device. Xerox Corporation, Robert E Cunha, March 21, 1989: US04814552 (129 worldwide citation)

This invention is an input device, or stylus, for entering hand drawn forms into a computer comprising a writing instrument, a pressure switch for determining whether the instrument is in contact with the writing surface, an acoustic transmitter for triangulating the position of the stylus on the su ...


2
Kenneth C Miller, J Courtenay Heater: Modular device for playing pranks. Mr Fun Guy, Limbach & Limbach, January 31, 1995: US05385344 (22 worldwide citation)

A system of remotely actuated novelty devices is disclosed having triggering and actuating components packaged in separate, interchangeable modules. The system includes several interchangeable trigger modules, each of which detects the occurrence of an activating event and in response generates a tr ...