Patent US4697015A successfully refreshed from Google Patents.
US4697015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystalline pyrimidinyl phenyl carboxylic acid ester derivatives
Assignee: Alps Alpine Co Ltd
•
Filing: 1986-10-02
•
Granted: 1987-09-29
•
Expires: 2006-10-02
Abstract
Abstract A liquid crystalline compound represented by the following general formula: ##STR1## where m and l represent individually integers within a range: 6≦m≦14 and 1≦l≦5, the symbol * represents an asymmetric carbon atom and the compound is required to be optically active. The compound can induce the twisting arrangement when added to the TN system or phase transition type liquid crystal mixture, as well as can improve the spontaneous polarization as the index of the ferroelectric property when added to the SmC* liquid crystal mixture.
Inventors
- 👤 Mitsuru Kano
- 👤 Jun Nakanowatari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:07
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3463
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A liquid crystalline compound represented by the following general formula: ##STR10## where m and l represent individually integers within a range as: 6≦m≦14 and 1≦l≦5, the symbol * reresents an asymmetric carbon atom and the compound is required to be optically active.
Claim 2
Dependent Claim
42 words
A liquid crystalline compound represented by the following general formula: ##STR10## where m and l represent individually integers within a range as: 6≦m≦14 and 1≦l≦5, the symbol * reresents an asymmetric carbon atom and the compound is required to be optically active.
Claim 3
Dependent Claim
19 words
The liquid crystalline compound as defined in claim 1, wherein the compound is (-)-4'-heptylpyrimidyl phenyl carboxylic acid 2-butanol ester.
Claim 4
Dependent Claim
19 words
The liquid crystalline compound as defined in claim 1, wherein the compound is (+)-heptylpyrimidyl phenyl carboxylic acid 2-butanol ester.
Claim 5
Dependent Claim
19 words
The liquid crystalline compound as defined in claim 1, wherein the compound is (-)-4-heptylpyrimidyl phenyl carboxylic acid 2-octanol ester.
Claim 6
Dependent Claim
19 words
The liquid crystalline compound as defined in claim 1, wherein the compound is (+)-4-heptylpyrimidyl phenyl carboxylic acid 2-octanol ester.
References Cited (Backward Citations)
US4311610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |