Changeable color display device

Details Changeable color display device Changeable color display device

1975-01-22

1976-06-22

Pitrelli, John F.

Card, picture, or sign exhibiting

Calendars

40219, 220246, 240 10A, G09F 1324

Patent

active

039641945

ABSTRACT:
A sealing cap prevents viscous fluid leakage from a display device of the type adapted for producing a constantly changing completely random multi-colored effect by the action of air bubbles traveling upwardly through the fluid contained in narrow working chamber gaps between parallel light transmissive walls of the device. An illumination source is provided for transmitting light through the walls and the fluid. Bubbling air is supplied from a manifold at the lower ends of the fluid containing gaps and vents from the upper ends of the gaps. A selectively displaceable sealing cap guards against leakage from the vents when the device is shut down. A reflective surface over the outer face of the device provides an opaque appearance when it is shut down.

REFERENCES:
patent: 2616585 (1952-11-01), Condit et al.
patent: 3388490 (1968-06-01), Stechemesser
patent: 3610918 (1971-10-01), Barlow
patent: 3692382 (1972-09-01), Cloutier
patent: 3706149 (1972-12-01), Olivieri
patent: 3745678 (1973-07-01), Thomassen
patent: 3780260 (1973-12-01), Elsner

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