Air-free liquid variable light filter system

Claim 2

The light energy screening and filtering device of claim 1 in which said pump is in the high gravity point connection between said cavity and said reservoir.

Claim 3

The light energy screening and filtering device of claim 1 in which a filter is positioned in at least one of the connections between said cavity and reservoir to clean said liquids.

Claim 4

The light energy screening and filtering device of claim 1 in which a bleeder valve is positioned in the system to eliminate air within the liquids.

Claim 5

The light energy screening and filtering device of claim 1 in which said reservoir has an expansion means for accommodating expansion and contraction of said liquids.

Claim 6

The light energy screening and filtering device of claim 6 in which said expansion means is a diaphragm in the side of said reservoir.

Claim 7

The light energy screening and filtering device of claim 6 in which said expansion means is a rubber ball covered with coarse mesh wire.

Claim 8

The light energy screening and filtering device of claim 1 in which said immiscible liquids are oils of different specific gravities.

Claim 9

The light energy screening and filtering device of claim 1 in which said immiscible liquids are of different colors.

Claim 10

The light energy screening and filtering device of claim 1 in which one oil is a light mineral oil and the other is a heavy glycol.

Claim 11

The light energy screening and filtering device of claim 1 in which two interphases are between the liquids in the system, one interphase rising as the other interphase descends as one liquid replaces the other in said cavity.

Claim 12

The light energy screening and filtering device of claim 1 in which said cavity is defined by two transparent curved plates spaced apart by a tubular gasket around the edge of the two plates.

Claim 13

The light energy screening and filtering device of claim 13 in which the plates are plastic.

Claim 14

The light energy screening and filtering device of claim 13 in which the plates are glass.

Claim 15

The light energy screening and filtering device of claim 1 in which a plurality of reservoirs is used each having a pump controlling it and a different liquid in each reservoir for providing a different filtering and screening effect to serve as one of the liquids in the system, and a common liquid for the other liquid in the system, whereby the operation of any one pump when the common liquid is in the cavity causes the particular liquid in the operated reservoir to fill the cavity.

Claim 16

The light energy screening and filtering device of claim 1 in which said transparent plates are positioned horizontally.

Claim 17

An hermetically sealed air-free device for screening and filtering light radiation comprising two spaced transparent plates having a gasket between them and positioned near their edges to define a sealed cavity therebetween; openings through one of said plates at the upper and lower gravity points of said cavity; a reservoir having upper and lower gravity point openings; a first conduit connecting the upper gravity point opening in said reservoir with the upper gravity point opening in said cavity and a second conduit connecting the lower gravity point opening in said reservoir with the lower gravity point opening in said cavity; two immiscible liquids of different specific gravities and of different light filtering properties completely filling said device and having at least two separate interphases between them within said device, said device being completely free of air; and a reversible pump positioned in said second conduit for pumping only the liquid of higher specific gravity to effect a movement of both liquids in or out of said cavity and in or out of said reservoir.

Claim 18

The light energy screening and filtering device of claim 1 in which said transparent plates form a substantial portion of an automobile roof.

Claim 19

The light energy screening and filtering device of claim 1 in which said transparent plates form a window in a building structure.

Claim 20

The light energy screening and filtering device of claim 1 in which said transparent plates form a portion of a roof in a building structure.

Claim 21

The light energy screening and filtering device of claim 1 in which said transparent plates form a canopy in an airplane.

Claim 22

The hermetically sealed air-free device of claim 18 in which said transparent plates are positioned horizontally.