US3779751A
Expired / Lapsed
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Liquid crystalline compositions
Assignee: Xerox Corp
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Filing: 1971-09-13
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Granted: 1973-12-18
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Expires: 1991-09-13
Abstract
Abstract Liquid crystalline compositions having a cholesteric mesophase are disclosed. The compositions have extended mesomorphic ranges and are stable at relatively low temperatures. Uses of the novel compositions in various electro-optic applications are also disclosed.
Inventors
- 👤 W Haas
- 👤 J Flannery
- 👤 B Mechlowitz
- 👤 J Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:31
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K19/42; C09K19/46; C09K19/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
An imaging process comprising providing a layer of an imaging material comprising a composition of claim 1 and providing an imagewise electrical field across said layer while said composition is in the cholesteric liquid crystalline phase to cause an imagewise change in the appearance of image portions of said imaging material layer while the background portions of said material layer retain an appearance substantially distinguishable from the image portions of said layer.
Claim 2
Dependent Claim
70 words
The process as defined in claim 2 wherein a pair of conductive electrode members are provided in spaced relationship, at least one of said electrodes being at least partially transparent, placing said imaging material layer between said members and applying an elEctrical field between said members while said composition is in the cholesteric liquid crystalline phase to cause a change in the appearance of said composition in an imagewise configuration.
Claim 3
Dependent Claim
19 words
The process as defined in claim 3 wherein at least one of said electrodes is shaped in image configuration.
Claim 4
Dependent Claim
49 words
The process as defined in claim 3 wherein at least one of said electrodes includes a photoconductive surface and said imagewise electrical field is applied across said imaging material layer by exposing said photoconductive surface to an imagewise pattern of activating radiation while applying a potential to said electrodes.
Claim 5
Dependent Claim
163 words
The method of producing a display comprising providing a display device comprising first and second spaced plates, at least one of which is substantially transparent, a plurality of parallel electrically conductive films on one face of said first plate, a plurality of parallel electrically conductive films on one face of said second plate, the plurality of films on at least one plate being substantially transparent, said two plates being positioned with faces bearing said parallel conductive films adjacent and parallel to each other and the direction of said conductive films on one plate being perpendicular to the direction of said conductive films on the other plate, and a liquid crystalline material comprising a composition of claim 1 filling the space between said plates and selectively energizing at least one conductive film on each plate while said composition is in the cholesteric liquid crystalline phase to cause an electric field to be selectively applied across said liquid crystalline material whereby an image is observed.
Claim 6
Dependent Claim
47 words
Liquid crystalline compositions having a cholesteric mesophase comprising from about 5 to about 99 weight percent of a cholesteric liquid crystalline material and from about 1 to about 95 weight percent of a nematic liquid crystalline composition comprising from about 50 to about 70 weight percent of
Claim 7
Dependent Claim
47 words
Liquid crystalline compositions having a cholesteric mesophase comprising from about 5 to about 99 weight percent of a cholesteric liquid crystalline material and from about 1 to about 95 weight percent of a nematic liquid crystalline composition comprising from about 60 to about 80 weight percent of
Claim 8
Dependent Claim
47 words
Liquid crystalline compositions having a cholesteric mesophase comprising from about 5 to about 99 weight percent of a cholesteric liquid crystalline material and from about 1 to about 95 weight percent of a nematic liquid crystalline composition comprising from about 50 to about 80 weight percent of
Claim 9
Dependent Claim
47 words
Liquid crystalline compositions having a cholesteric mesophase comprising from about 5 to about 99 weight percent of a cholesteric liquid crystalline material and from about 1 to about 95 weight percent of a nematic liquid crystalline composition comprising from about 50 to about 70 weight percent of
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |