US3743382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method, material and apparatus for increasing and decreasing the transmission of radiation
Assignee: Research Frontiers Inc
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Filing: 1971-04-12
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Granted: 1973-07-03
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Expires: 1991-04-12
Abstract
Abstract A light control valve is disclosed having certain fluid suspensions therein which when activated increase the transmission of radiation through the valve in one part of the electromagnetic spectrum and decrease the transmission in another part of the spectrum.
Inventors
- 👤 P Rosenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
203 words
A light valve for controlling the transmission of radiation in the electromagnetic spectrum comprising: a cell having front and rear wall sections spaced apart a distance which is small compared to the lateral dimensions of the sections a fluid suspension in said cell of minute particles dispersed therein capable of having their orientation changed by the application of an electric field to the suspension to change the transmission of radiation through the suspension means for applying an electric field to the suspension between said wall sections in a direction substantially parallel to the direction of transmission of radiation through the suspension and substantially perpendicular to said wall sections, and said suspension being characterized in that it is responsive to said field applied in said direction to decrease the level of transmission of radiation therethrough, in part of the electromagnetic spectrum, below the level of transmission of radiation in this part of the spectrum when said field is not applied to the suspension and to simultaneously increase the level of transmission of radiation therethrough, in another part of the electromagnetic spectrum, above the level of transmission of radiation in this other part of the spectrum when said field is not applied to the suspension.
Claim 2
Dependent Claim
203 words
A light valve for controlling the transmission of radiation in the electromagnetic spectrum comprising: a cell having front and rear wall sections spaced apart a distance which is small compared to the lateral dimensions of the sections a fluid suspension in said cell of minute particles dispersed therein capable of having their orientation changed by the application of an electric field to the suspension to change the transmission of radiation through the suspension means for applying an electric field to the suspension between said wall sections in a direction substantially parallel to the direction of transmission of radiation through the suspension and substantially perpendicular to said wall sections, and said suspension being characterized in that it is responsive to said field applied in said direction to decrease the level of transmission of radiation therethrough, in part of the electromagnetic spectrum, below the level of transmission of radiation in this part of the spectrum when said field is not applied to the suspension and to simultaneously increase the level of transmission of radiation therethrough, in another part of the electromagnetic spectrum, above the level of transmission of radiation in this other part of the spectrum when said field is not applied to the suspension.
Claim 3
Dependent Claim
13 words
The light valve of claim 1 wherein the minute particles comprise titanium dioxide.
Claim 4
Dependent Claim
13 words
The light valve of claim 1 wherein the minute particles comprise iron oxide.
Claim 5
Dependent Claim
13 words
The light valve of claim 1 wherein the minute particles comprise cobalt aluminate.
Claim 6
Dependent Claim
44 words
The light valve of claim 1 wherein the part of the electromagnetic spEctrum where the level of transmission is decreased and the part of the electromagnetic spectrum where the level of transmission is increased are both in the visible section of the electromagnetic spectrum.
Claim 7
Dependent Claim
43 words
The light valve of claim 1 wherein filter means are provided to attenuate the light transmitted through the light valve in that portion of the visible spectrum where the level of transmission of radiation is increased in response to an applied electric field.
Claim 8
Dependent Claim
43 words
The light valve of claim 1 wherein filter means are provided to attenuate the light transmitted through the light valve in that portion of the visible spectrum where the level of transmission of radiation is decreased in response to an applied electric field.
Claim 9
Dependent Claim
159 words
A material for controlling the transmission of radiation in the electromagnetic spectrum comprising a fluid suspension including: a suspending medium and a plurality of minute particles dispersed therein capable of having their orientation changed by the application of an electric field to the suspension to change the transmission of radiation through the suspension, said suspension being characterized in that it is responsive to said field applied in a direction substantially parallel to the direction of transmission of radiation through the suspension to decrease the level of transmission of radiation therethrough, in part of the electromagnetic spectrum, below the level of transmission of radiation in this part of the spectrum, when said field is not applied to the suspension, and to simultaneously increase the level of transmission of radiation therethrough, in another part of the electromagnetic spectrum, above the level of transmission of radiation in this other part of the spectrum when the field is not applied to the suspension.
Claim 10
Dependent Claim
159 words
A material for controlling the transmission of radiation in the electromagnetic spectrum comprising a fluid suspension including: a suspending medium and a plurality of minute particles dispersed therein capable of having their orientation changed by the application of an electric field to the suspension to change the transmission of radiation through the suspension, said suspension being characterized in that it is responsive to said field applied in a direction substantially parallel to the direction of transmission of radiation through the suspension to decrease the level of transmission of radiation therethrough, in part of the electromagnetic spectrum, below the level of transmission of radiation in this part of the spectrum, when said field is not applied to the suspension, and to simultaneously increase the level of transmission of radiation therethrough, in another part of the electromagnetic spectrum, above the level of transmission of radiation in this other part of the spectrum when the field is not applied to the suspension.
Claim 11
Dependent Claim
12 words
The material of claim 8 wherein the minute particles comprise titanium dioxide.
Claim 12
Dependent Claim
12 words
The material of claim 8 wherein the minute particles comprise iron oxide.
Claim 13
Dependent Claim
12 words
The material of claim 8 wherein the minute particles comprise cobalt aluminate.
Claim 14
Dependent Claim
43 words
The material of claim 8 wherein the part of the electromagnetic spectrum where the level of transmission is decreased and the part of the electromagnetic spectrum where the level of transmission is increased are both in the visible section of the electromagnetic spectrum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |