US3769313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N - (p-n-alkoxycarbonyloxybenzylidene)-p'-aminophenylacetate liquid crystal compounds
Assignee: OI Glass Inc
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Filing: 1971-06-30
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Granted: 1973-10-30
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Expires: 1991-06-30
Abstract
Abstract THERE IS DISCLOSED THE PREPARATION OF LIQUID-CRYSTAL COMPOUNDS OF THE STRUCTURE: (4-(CXH(2X+1)-O-CO-O-)PHENYL)-CH=N-(1,4-PHENYLENE)-CO-CO- CH3 WHERE X IS AN INTEGER OF 1 TO 10. THE COMPOUNDS ARE PREPARED BY THE REACTION OF PARA-ACETOXYANILINE AND PARA-NALKOXYCARBONYLOXYBENZALDEHYDE.
Inventors
- 👤 H Dietrich
- 👤 E Steiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:25
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |