Patent US5062761A successfully refreshed from Google Patents.
US3652148A
Expired / Lapsed
US
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Imaging system
Assignee: Xerox Corp
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Filing: 1969-05-05
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Granted: 1972-03-28
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Expires: 1989-05-05
Abstract
Abstract A system transforming an optically negative liquid crystalline substance to an optically positive liquid crystalline mesophase by an applied electrical field, and an imaging system wherein the electrical field-induced transition images a liquid crystalline member.
Inventors
- 👤 Joseph J Wysocki
- 👤 James E Adams
- 👤 James H Becker
- 👤 Robert W Madrid
- 👤 Werner E L Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:43
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133348; C; C09; C09K; C09K19/00; C09K19/04; C09K19/36; G02F1/135; G02F1/137; G02F1/13731; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
27 words
The method of claim 1 wherein the step of providing an optically negative liquid crystalline material comprises providing a liquid crystalline material in the cholesteric mesophase structure.
Claim 2
Independent Claim
62 words
The method of producing a cholesteric to nematic phase transition in an initially cholesteric liquid crystalline material comprising providing a cholesteric liquid crystalline material at a temperature in the cholesteric-nematic phase transition temperature range of said liquid crystalline material and applying an electrical field across said liquid crystalline material within the cholesteric-nematic phase transition electrical field range of said liquid crystalline material.
Claim 3
Dependent Claim
42 words
The method of producing a transient imaging system comprising performing the method of claim 1 and reducing the electrical field across the liquid crystalline material to a field strength below the negative-positive optical transition threshold field strength of the liquid crystalline material.
Claim 4
Dependent Claim
41 words
The method of claim 4 additionally comprising providing means for enhancing contrast between image and background areas in the liquid crystalline material wherein the imaged liquid crystalline material is viewed with said means for enhancing contrast between image and background areas.
Claim 5
Dependent Claim
25 words
The method of claim 4 additionally comprising providing the liquid crystalline material between polarizers wherein the imaged liquid crystalline material is viewed between said polarizers.
Claim 6
Dependent Claim
35 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a material selected from the group consisting of cholesteryl chloride, cholesteryl bromide, cholesteryl iodide, cholesteryl fluoride, and mixtures thereof.
Claim 7
Dependent Claim
23 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a cholesteryl ester of a carboxylic acid.
Claim 8
Dependent Claim
24 words
The method of claim 7 wherein the step of providing cholesteric liquid crystalline material additionally comprises providing a cholesteryl ester of a carboxylic acid.
Claim 9
Dependent Claim
22 words
The method of claim 2 wherein the step of providing liquid crystalline material additionally comprises providing material having the nematic mesophase structure.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein the step of providing liquid crystalline material additionally comprises providing a material having the nematic mesophase structure.
Claim 11
Dependent Claim
23 words
The method of claim 8 wherein the step of providing liquid crystalline material additionally comprises providing a material having the nematic mesophase structure.
Claim 12
Dependent Claim
23 words
The method of claim 9 wherein the step of providing liquid crystalline material additionally comprises providing a material having the nematic mesophase structure.
Claim 13
Dependent Claim
77 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising cholesteryl chloride, cholesteryl nonanoate, and cholesteryl oleyl carbonate. 15 The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising cholesteryl chloride and cholesteryl nonanoate. 16 The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising cholesteryl chloride and cholesteryl propionate.
Claim 14
Dependent Claim
87 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising about 30 percent by weight cholesteryl chloride, about 56 percent cholesteryl nonanoate, and about 14 percent cholesteryl oleyl carbonate at a transition temperature in the range of about 20* to about 57* C. and the step of applying an electric field comprises applying an electrical field of strength in the range of about 2.7 X 105 to about 4.0 X 105 volts per centimeter of liquid crystalline material.
Claim 15
Dependent Claim
79 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising about 20 percent by weight cholesteryl chloride and about 80 percent cholesteryl nonanoate at a transition temperature in the range of about 20* to about 75* C. and the step of applying an electric field comprises applying an electrical field of strength in the range of about 11 X 105 to about 5.3 X 105 volts/cm. of liquid crystalline material.
Claim 16
Dependent Claim
79 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising about 60 percent by weight cholesteryl chloride and about 40 percent cholesteryl nonanoate at a transition temperature in the range of about 25* to about 60* C. and the step of applying an electric field comprises applying an electrical field of strength in the range of about 4 X 103 to about 4 X 104 volts/cm. of liquid crystalline material.
Claim 17
Dependent Claim
72 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising about 65 percent by weight of cholesteryl chloride and about 35 percent cholesteryl nonanoate at a transition temperature in the range of about 20* to about 60* C. and the step of applying an electric field comprises applying an electrical field of strength of about 7.4 X 104 volts/cm. of liquid crystalline material.
Claim 18
Dependent Claim
71 words
The method of claim 2 wherein the step of providing cholesteric liquid crystalline material comprises providing a mixture comprising about 48 percent by weight cholesteryl chloride and about 52 percent cholesteryl propionate at a transition temperature in the range of about 20* to about 80* C. and the step of applying an electric field comprises applying an electrical field of strength of about 2.8 X 104 volts/cm. of liquid crystalline material.
Claim 19
Dependent Claim
50 words
The method of claim 2 additionally comprising providing a pair of electrodes, one of which is substantially transparent, on opposite sides of the liquid crystalline material, and providing a source of electrical potential difference operatively connected to said electrodes, whereby said electrical field is applied across said liquid crystalline material.
Claim 20
Dependent Claim
23 words
The method of claim 22 wherein said step of providing liquid crystalline material comprises providing a mixture comprising cholesteryl chloride and cholesteryl nonanoate.
Claim 21
Dependent Claim
59 words
The method of claim 23 wherein said step of providing liquid crystalline material comprises providing a mixture comprising cholesteryl chloride in an amount in the range of about 20 percent to about 65 percent by weight, and said mixture comprises cholesteryl nonanoate present in an amount in the range of about 35 percent to about 80 percent by weight.
Claim 22
Dependent Claim
23 words
The method of claim 22 wherein said step of providing liquid crystalline material comprises providing a mixture comprising cholesteryl chloride and cholesteryl propionate.
Claim 23
Dependent Claim
26 words
The method of claim 22 wherein said step of providing liquid crystalline material comprises providing a mixture comprising cholesteryl chloride, cholesteryl nonanoate, and cholesteryl oleyl carbonate.
Claim 24
Dependent Claim
41 words
The method of claim 26 wherein said step of providing liquid crystalline material comprises providing a mixture comprising about 30 percent by weight cholesteryl chloride, about 56 percEnt by weight cholesteryl nonanoate and about 14 percent by weight cholesteryl oleyl carbonate.
Claim 25
Dependent Claim
28 words
The method of claim 1 additionally comprising applying said electrical field in an imagewise configuration across said liquid crystalline material, whereby said liquid crystalline material is imagewise transformed.
Claim 26
Dependent Claim
41 words
The method of claim 28 additionally comprising providing means for addressing the liquid crystalline material with an electron beam whereby the electrical field across the liquid crystalline material is created in a desired image configuration by said electron beam address system.
References Cited (Backward Citations)
GB1123117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |