US3790498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory liquid crystal compositions
Assignee: Seiko Instruments Inc
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Filing: 1971-11-22
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Granted: 1974-02-05
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Expires: 1991-11-22
Abstract
Abstract MEMORY LIQUID CRYSTAL COMPOSITIONS CONTAINING FROM 8095% BY WEIGHT OF ONE OR MORE NEMATIC CRYSTAL LIQUID COMPOUNDS OF THE FORMULA 1-(R2-COO-),4-((4-R1-PHENYL)-OOC-)BENZENE WHEREIN R1 AND R2 ARE ALKYL AND ALKOXY AND MAY BE THE SAME OR DIFFERNET, AND 5-20% BY WEIGHT OF A CARBOXYLIC ACID ESTER OF CHOLESTEROL, SITOSTEROL OR STIGMASTEROL ARE USEFUL IN DISPLAY DEVICES AT ROOM TEMPERATURE.
Inventors
- 👤 Y Katagiri
- 👤 Y Miyata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:42
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |