Velcon Filters, Inc.

Electroprint, Inc.

George J Eilers

Gerald L Pressman

Lucian W Taylor

Hewitt D Crane

A machine for making a copy on a medium such as paper of a visual image. Particles of toner material are accelerated toward the paper through an apertured screen. Formed on the screen is a pattern of electrostatic charge regions that corresponds to the image so that the arrangement of the toner particles impinging on the paper corresponds to the image. A composite apertured screen composed of two conductive layers separated by an insulative layer and having an insulative layer on one outer surface. Means for establishing oppositely polarized fields across the inner insulative layer and across the outer insulative layer. One of the fields is selectively discharged to control the passage of toner particles through the apertures in the screen.

Method and apparatus for forming a positive electrostatic image

A system for evaluating the performance of a sailing boat wherein average boat speed, average apparent wind speed and average apparent wind direction are sensed and are utilized to determine the performance characteristics of sailing boats. The system includes an apparent wind direction indicator which senses the instantaneous apparent wind direction and compares it with a previously generated average apparent wind direction signal to obtain an error signal. The error signal is intergrated to obtain an average error signal which is utilized to correct the previously generated average apparent wind direction signal by changing the position of an average apparent wind direction indicator.

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Redwood City, CA, United States of America

George J Eilers