# US 4,395,835 A · Liquid rainbow > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,835 A - Document ID: US4395835A - Status: Granted - Kind: A - Application number: 06/244,160 - Filed: 1981-03-16 - Granted: 1983-08-02 - Earliest claimed: 1981-03-16 - Inventors: Ronald A. Schneider - Web page: https://patentgrep.com/patent/US4395835A ## CPC - G09F 13/24: using tubes or the like filled with liquid, e.g. bubbling liquid - A63H 33/22: Optical, colour, or shadow toys ({puzzles with optical elements A63F9/0613}; kaleidoscopes G02B27/08) - B44F 1/066: {comprising at least two transparent elements, e.g. sheets, layers (layered products of glass and synthetic resin containing decorations or patterns B32B17/10247; window units comprising two or more parallel glass panes E06B3/66)} - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - A63H: TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS - B44F: SPECIAL DESIGNS OR PICTURES ## Abstract Devices comprising a transparent chamber containing three mutually immiscible liquids two of which are colored yellow, cyan, or magenta with an external region colored yellow, cyan, or magenta. Static, they display four or more colored regions. When deformed or inverted, they create multicolor kinetic displays. Preferred devices comprise two liquid-filled, sheet-like chamberss in face to face relationship with five colored bands forming a rainbow pattern. ## Claims ### Claim 1 A display device comprising two transparent sealed sheet-like chambers in face to face relationship containing colored liquids, (A) one chamber containing at least three multually immiscible liquid phases at least two of which are colored with colors selected from the group consisting of yellow, cyan, and magenta, and (B) a second chamber containing at least two mutually immiscible liquid phases at least one of which is colored with colors selected from the group consisting of yellow, cyan, and magenta, the volumes of said liquid phases being selected such that when the device is vertical and at rest, each of said at least two liquid phases in said second chamber are in overlapping relationship with at least two of the liquid phases in said one chamber, such that one horizontal ray of light can pass through one liquid in one chamber and a second liquid in the second chamber; a second horizontal ray passing through the same two chambers can pass through a different combination of two liquids; a third horizontal ray passing through the same two chambers can pass through a third combination of two liquids; and a fourth horizontal ray passing through the same two chambers can pass through a fourth combination of two liquids. ### Claim 2 (depends on 1) The device of claim 1 consisting of less than three liquid-containing chambers, such that when the decive is vertical and at rest and illuminated with white light, at least four bands of color can be perceived, each color different from any of the other three and a member of the group consisting of red, yellow, green, cyan, blue, and magenta. ### Claim 3 (depends on 2) The device of claim 2 wherein the observed colors form a rainbow pattern. ### Claim 4 (depends on 1) The device of claim 1 wherein when the device is vertical and at rest and illumunated with white light, at least five bands of color can be perceived, each of the five colors being different from any of the other four. ### Claim 5 (depends on 4) The device of claim 4 wherein the perceived colors include red, yellow, green, cyan, and blue, in that order. ### Claim 6 (depends on 4) The deive of claim 4 wherein the interior space in each chamber is less than one-tenth as thick as it is wide, and the path of light rays forming each of at least five bands of color passes sequentially through one liquid in one chamber and then another liquid in a second chamber. ### Claim 7 (depends on 6) The device of claim 6 wherein the perceived colors include red, yellow, green, cyan, and blue, in that order, and the device consists of no more than two sheet-like, liquid-containing chambers. ### Claim 8 (depends on 1) The device of claim 1 wherein said overlapping colors synthesize red, blue, and green by the superposition of yellow and magenta, cyan and magenta, and yellow and cyan. ### Claim 9 (depends on 1) The device of claim 1 wherein the interior space in each chamber is less than one-tenth as thick as it is wide, said one chamber contains three mutually immiscible liquid phases, the top liquid having a color selected from the group consisting of yellow, cyan, and magenta, the bottom liquid having a color selected from the group consisting of those two colors not selected for the top liquid, and the middle liquid being substantially colorless, tinted by the colors of the two adjacent layers to only a minor extent, and said second chamber contains at least two mutually immiscible liquid phases at least one of which is colored a color selected from the group consisting of yellow, cyan, and magenta, said color being one not selected for any layer of any other chamber. ### Claim 10 (depends on 1) The device of claim 1 wherein at least five liquid phases are colored with the colors being selected from the group consisting of yellow, magenta, and cyan. ### Claim 11 (depends on 1) The device of claim 1 wherein when the device is vertical and at rest, white light passing through it horizontally emerges (a) from one section with more that 10% of the light having been transmitted at one wavelength selected from the group consisting of 450, 540, and 610 nm, and less than 5% of the light having been transmitted at the other two wavelengths, and (b) from another section with more than 10% of the light having been transmitted at a different one of said wavelengths and less than 5% having been transmitted at the other two, and (c) from another section with more than 10% of the light having been transmitted at two of said wavelengths and less than 5% at the third, and (d) from yet another section with more than 10% of the light having been transmitted at a different two of said wavelengths and less than 5% at the third.