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Patent US3770654A successfully refreshed from Google Patents.
US3770654A
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Nematic liquid crystal
Assignee: Seiko Instruments Inc
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Filing: 1971-04-27
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Granted: 1973-11-06
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Expires: 1991-04-27
Abstract
Abstract NEMATIC LIQUID CRYSTAL COMPOSITIONS HAVING A LIQUID CRYSTAL RANGE INCLUDING AMBIENT TEMPERATURE ARE DISCLOSED. THE COMPOSITIONS INCLUDE AT LEAST ONE COMPOUND HAVING THE GENERAL CHEMICAL FORMULA (4-(R1-O-)PHENYL)-OOC-(1,4-PHENYLENE)-O-COO-R2 WHEREIN R1 AND R2 ARE ALKYL GROUPS HAVING THE GENERAL FORMULA CH3(CH2)N, AND AT LEAST ONE COMPOUND HAVING THE GENERAL CHEMICAL FORMULA (4-(C2H5-)PHENYL)-OOC-(1,4-PHENYLENE)-O-COO-R3 WHEREIN R3 IS EITHER N-C4H9 OR N-C5H11.
Inventors
- 👤 Y Katagiri
- 👤 Y Miyata
- 👤 O Nagasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/2028; C09K2019/2035
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |