US3580864A
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US
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Cholesteric-phase liquid-crystal compositions stabilized against true-solid formation,using cholesteryl erucyl carbonate
Assignee: Westinghouse Electric Corp
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Filing: 1969-04-30
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Granted: 1971-05-25
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Expires: 1989-04-30
Abstract
Abstract STABILITY OF CHOLESTERIC-PHASE LIQUID-CRYSTAL COMPOSITIONS IS IMPROVED BY INOCORPORATING THEREIN AN AMOUNT, UP TO 100%, OF CHOLESTERYL ERUCYL CARBONATE, A NOVEL COMPOUND, MADE BY REACTION OF CHOLESTERYL CHLOROFORMATE WITH ERUCYL ALCOHOL AND PYRIDINE. THE NOVEL CARBONATE DOES NOT CRYTALLIZE TO TRUE SOLID IN SEVERAL MONTHS, WHEREAS MOST OTHER LIQUID-CRYSTAL COMPOSITIONS TRANSFORM TO TRUE SOLID WITHIN SEVERAL HOURS TO SEVERAL DAYS. MOREOVER, THE NOVEL CARBONATE DOES ITELF EXIBIT A COLOR PLAY, SO THAT IT MAY BE USED IN VERY LARGE AMOUNTS IN CHOLESTERIC-PHASE LIQUIDCRYSTAL COMPOSITIONS, WITHOUT DECREASING THE VIVIDNESS OF THE COLOR CHANGES EXHIBITED THEREBY.
Inventors
- 👤 Newton N Goldberg
- 👤 James L Fergason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:39
CPC Classifications
C; C07; C07J; C07J9/00; B; B01; B01J; B01J19/00; G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249997; Y10T428/26; Y10T428/268
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |