US3720623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated liquid crystals
Assignee: NCR Voyix Corp
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Filing: 1971-02-08
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Granted: 1973-03-13
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Expires: 1991-02-08
Abstract
Abstract A mixture of cholesteric liquid crystal material such as cholesteryl nonanoate and nematic liquid crystal material such as methoxybenzilidene-p-n-butylaniline is disclosed. The mixture can be encapsulated and employed in temperature-sensitive visual display devices. The addition of nematic liquid crystal material to cholesteric liquid crystal material enhances the brightness of films employing cholesteric liquid crystal material and prolongs the usable life of the films.
Inventors
- 👤 J Cartmell
- 👤 D Churchill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:18
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/132; G02F1/133; G02F1/1333; G02F1/1334; C; C09; C09K; C09K2323/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A mass of minute individual capsules having light-transmitting capsule walls and having core material consisting essentially of 60 to 90 weight percent of at least one cholesteric liquid crystal material and 5 to 40 weight percent of at least one nematic liquid crystal material of alkoxybenzilidene-p-n-alkylanilines or hydroxyalkoxybenzilidene-p-n-alkylanilines wherein each alkoxy, hydroxyalkoxy or alkyl group has one to four carbon atoms, wherein the capsules range in average diameter from 5 to 1,000 microns.
Claim 2
Dependent Claim
73 words
A mass of minute individual capsules having light-transmitting capsule walls and having core material consisting essentially of 60 to 90 weight percent of at least one cholesteric liquid crystal material and 5 to 40 weight percent of at least one nematic liquid crystal material of alkoxybenzilidene-p-n-alkylanilines or hydroxyalkoxybenzilidene-p-n-alkylanilines wherein each alkoxy, hydroxyalkoxy or alkyl group has one to four carbon atoms, wherein the capsules range in average diameter from 5 to 1,000 microns.
Claim 3
Dependent Claim
31 words
Capsules according to claim 1 wherein the core material consists essentially of 70 to 90 weight percent of the cholesteric material and 10 to 30 weight percent of the nematic material.
Claim 4
Dependent Claim
31 words
Capsules according to claim 1 wherein the cholesteric material is cholesteryl nonanoate, cholesteryl chloride, oleyl cholesteryl carbonate or cholesteryl cinnamate and the nematic material is methoxybenzilidene-p-n-butylaniline, ethoxybenzilidene-p-n-butylaniline, propoxybenzilidene-p-n-ethylaniline, hydroxyethoxybenzilidene-p-n-propylaniline or propoxybenzilidene-p-n-propylaniline.
Claim 5
Dependent Claim
34 words
Capsules according to claim 1 wherein the weight percent of cholesteric material is 80, the weight percent of nematic material is 20, the cholesteric material is cholesteryl nonanoate and the nematic material is methoxybenzilidene-p-n-butylaniline.
Claim 6
Dependent Claim
21 words
Capsules according to claim 1 wherein the cholesteric material is cholesteryl nonanoate and cholesteryl chloride and the nematic material is methoxybenzilidene-p-n-butylaniline.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |