US4097127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed liquid crystalline texture formation
Assignee: Xerox Corp
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Filing: 1977-03-02
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Granted: 1978-06-27
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Expires: 1997-03-02
Abstract
Abstract A mixture of the Grandjean texture and the focal-conic texture of the cholesteric mesophase is created by applying an electrical field to a liquid crystalline material in either the focal-conic or Grandjean texture of the cholesteric mesophase of a magnitude sufficient to transform the liquid crystalline material from the cholesteric mesophase to the nematic mesophase; and, decreasing the magnitude of said electrical field over a period of time effective to transform the liquid crystalline material from the nematic mesophase to a mixture of the Grandjean and focal-conic textures of the cholesteric mesophase.
Inventors
- 👤 Werner E. L. Haas
- 👤 Gary A. Dir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13718; G02F1/13731
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A method of forming a mixture of the Grandjean and focal-conic textures of the cholesteric mesophase, comprising: (a) providing a liquid crystalline material in a texture selected from the group consisting of the Grandjean texture and the focal-conic texture of the cholesteric mesophase; (b) applying an electrical field across said liquid crystalline material within the cholesteric-to-nematic electrical field range of said liquid crystalline material thereby transforming said liquid crystalline material from the cholesteric mesophase to the nematic mesophase; and (c) decreasing the magnitude of said applied electrical field over a period of time effective to transform said liquid crystalline material from the nematic mesophase to said mixture of the Grandjean and focal-conic textures of the cholesteric mesophase.
Claim 2
Independent Claim
117 words
A method of forming a mixture of the Grandjean and focal-conic textures of the cholesteric mesophase, comprising: (a) providing a liquid crystalline material in a texture selected from the group consisting of the Grandjean texture and the focal-conic texture of the cholesteric mesophase; (b) applying an electrical field across said liquid crystalline material within the cholesteric-to-nematic electrical field range of said liquid crystalline material thereby transforming said liquid crystalline material from the cholesteric mesophase to the nematic mesophase; and (c) decreasing the magnitude of said applied electrical field over a period of time effective to transform said liquid crystalline material from the nematic mesophase to said mixture of the Grandjean and focal-conic textures of the cholesteric mesophase.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said period of time within step (c) is from about 10 to about 200 milli-seconds.
Claim 4
Dependent Claim
15 words
The method according to claim 1 wherein said electrical field is applied in imagewise configuration.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein said liquid crystalline material comprises a nematic liquid crystalline material and an optically active material.
Claim 6
Dependent Claim
20 words
The method according to claim 1 wherein said liquid crystalline material is in the Grandjean texture of the cholesteric mesophase.
Claim 7
Dependent Claim
49 words
The method according to claim 5 wherein said electrical field is applied in imagewise configuration resulting in an imagewise configured mixture of the Grandjean and focal-conic textures of the cholesteric mesophase surrounded by a background region of the liquid crystalline material in the Grandjean texture of the cholesteric mesophase.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |