Card – picture – or sign exhibiting – Display device with gas or liquid movement
Reexamination Certificate
2002-02-14
2003-07-22
Hoge, Gary (Department: 3611)
Card, picture, or sign exhibiting
Display device with gas or liquid movement
C040S435000
Reexamination Certificate
active
06594929
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to display devices.
BACKGROUND
The present invention seeks to provide a new and inventive form of display device which provides a continuous effect of changing colours.
SUMMARY OF THE INVENTION
The present invention proposes a display device which includes a plurality of superimposed light-transmitting walls defining at least one intervening chamber containing two immiscible fluids which are distinguished by colour, in which the said walls are mounted for rotation about an axis which is substantially normal to their plane, and the or each chamber includes means for collecting fluid at one region of the chamber, carrying it to another region of the chamber and releasing the fluid as the walls rotate.
In the present context the term “distinguished by colour” will be understood to embrace the possibility of at least one of the fluids being colourless, white or black.
The fluids preferably have different densities.
The means for collecting and releasing the fluid preferably includes a plurality of cup-shaped recesses disposed at the periphery of the or each chamber.
In a preferred form of the invention the walls define a plurality of chambers containing fluids with different colour combinations.
REFERENCES:
patent: 5151829 (1992-09-01), Hwang
patent: 5706594 (1998-01-01), Lin
patent: 6393744 (2002-05-01), Snyder
Dorman Ira S.
Hoge Gary
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