Electrophoretic elapsed time indicator
AssigneeNorth American Philips Corporation
InventorRoger P. White
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Abstract
An elapsed time indicator is constructed to operate by electrophoresis wherein light colored particles suspended in an organic liquid are caused to move in a tube device by applied electric fields. The movement of the colored particles results in a visible color bar being indicative of the transit time of the particle, and providing an indication of elapsed time. Reversal of the polarity on the device results in its reuse.
Claims6
An electrophoretic elapsed time indicator comprising an electrophoretic suspension including colloidal particles suspended in a liquid, said particles providing a contrasting color to said liquid, means including a small inside diameter transparent tube for containing said electrophoretic suspension, and means including respective electrodes at each end of said tube for applying a DC voltage across said containing means and moving said particles from one end of said tube to the other end of said tube under said DC voltage in a predetermined time period for indicating said time period.
Dependencies are inferred from the claim text.