US3697150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optic systems in which an electrophoretic-like or dipolar material is dispersed throughout a liquid crystal to reduce the turn-off time
Assignee: Xerox Corp
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Filing: 1971-01-06
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Granted: 1972-10-10
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Expires: 1991-01-06
Abstract
Abstract A system for transforming an optically negative liquid crystalline mesophase composition to an optically positive liquid crystalline mesophase composition by an applied electrical field, and imaging compositions which facilitate the relaxation of the transformed optically positive composition into the initial optically negative state. The invention also encompasses imaging systems wherein this electrical field-induced transition images a liquid crystalline imaging composition.
Inventors
- 👤 Joseph J Wysocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/36; C09K19/52; C09K19/54; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13731; G02F1/17; G02F1/172; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
17 words
The method of claim 1 wherein the optically negative liquid crystalline composition exhibits cholesteric liquid crystalline characteristics.
Claim 2
Independent Claim
77 words
The method of producing a cholesteric to nematic phase transition in a liquid crystalline material comprising providing a cholesteric liquid crystalline composition at a temperature in the cholesteric mesophase temperature range of said liquid crystalline composition, said liquid crystalline composition additionally comprising an additive of electrophoretic-like or dipolar material dispersed throughout said liquid crystalline composition, and applying an electrical field across said liquid crystalline composition within the cholesteric-nematic phase transition electrical field range of said liquid-crystalline composition.
Claim 3
Dependent Claim
41 words
The method of producing a transient electro-optic effect comprising performing the method of claim 2 and reducing the electrical field across the liquid crystalline composition to a field strength below the phase transition threshold field strength of the liquid crystalline composition.
Claim 4
Dependent Claim
18 words
The method of claim 4 wherein the additive is soluble or miscible in the cholesteric liquid crystalline composition.
Claim 5
Dependent Claim
18 words
The method of claim 4 wherein the additive is insoluble and immiscible in the cholesteric liquid crystalline composition.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said additive comprises not greater than about 15 percent of the entire composition.
Claim 7
Dependent Claim
20 words
The method of claim 4 wherein the additive comprises particles of average particle size not greater than about 5 microns.
Claim 8
Dependent Claim
20 words
The method of claim 8 wherein the additive comprises particles of average particle size not greater than about 1 micron.
Claim 9
Dependent Claim
18 words
The method of claim 4 wherein the liquid crystalline composition is arranged in a layer of said composition.
Claim 10
Dependent Claim
18 words
The method of claim 10 wherein said layer is of a thickness not greater than about 250 microns.
Claim 11
Dependent Claim
23 words
The method of claim 11 wherein said layer is of a thickness in the range between about 1 micron and about 50 microns.
Claim 12
Dependent Claim
18 words
The method of claim 4 wherein the electrical field placed across the composition is in an imagewise configuration.
Claim 13
Dependent Claim
23 words
The method of claim 10 wherein the layer of composition is provided between a pair of electrodes, one of which is substantially transparent.
Claim 14
Dependent Claim
11 words
The method of claim 14 wherein both electrodes are substantially transparent.
Claim 15
Dependent Claim
20 words
The method of claim 14 wherein said layer of cholesteric liquid crystalline composition is shaped in a desired image configuration.
Claim 16
Dependent Claim
19 words
The method of claim 14 wherein at least one of the electrodes is shaped in a desired image configuration.
Claim 17
Dependent Claim
33 words
The method of claim 10 wherein the electrical field applied across the liquid crystalline composition is of a field strength not less than about 102 volts/cm. of thickness of the liquid crystalline composition.
Claim 18
Dependent Claim
22 words
The method of claim 10 wherein the composition layer is viewed with means for enhancing contrast between transformed and nontransformed areas thereof.
Claim 19
Dependent Claim
17 words
The method of claim 10 wherein the composition layer is between polarizers and viewed with transmitted light.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |