US3756694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric field controllable birefringence liquid crystal media and optical display devices for use thereof
Assignee: WALTER E HELLER WESTERN Inc
•
Filing: 1971-09-09
•
Granted: 1973-09-04
•
Expires: 1991-09-09
Abstract
Abstract Thin flat panel display devices utilize optical polarization elements to control the amount and location of light transmitted through liquid crystal media having electric field controllable birefringence properties. Nematic liquid crystal compositions are provided, particularly adapted for use in such display systems, that demonstrate electric field controllable birefringence properties, for example, from above room temperature to about 30* Centigrade. These compositions include binary mixtures of ptoluylidene p-n-butylaniline with p-n-butoxybenzylidene p-nbutylaniline or pentyl p-anisylidene p-aminophenyl carbonate with p-ethoxybenzylidene p-n-butylaniline. Ternary compositions may be formed by adding ionizable materials.
Inventors
- 👤 R Soree
- 👤 M Rafuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:01
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/1343; G02F1/134309
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
12 words
The composition described in claim 1 wherein the alkoxy radical is p-ethoxy.
Claim 2
Dependent Claim
12 words
The composition described in claim 1 wherein the alkoxy radical is p-butoxy.
Claim 3
Dependent Claim
16 words
The composition described in claim 1 consisting of: an alkoxybenzylidene p-n-butylaniline as represented by the formula:
Claim 4
Dependent Claim
36 words
The composition described in claim 1 containing substantially 20 to 65 parts in a hundred parts by weight of the compound pentyl p-anisylidene p-aminophenyl carbonate, a substantial portion of the remainder being the compound p-ethoxybenzylidene p-n-butylaniline.
Claim 5
Dependent Claim
36 words
The composition described in claim 1 containing substantially 20 to 40 parts in a hundred parts by weight of the compound pentyl p-anisylidene p-aminophenyl carbonate, a substantial portion of the remainder being the compound p-ethoxybenzylidene p-n-butylaniline.
Claim 6
Dependent Claim
36 words
The composition described in claim 1 containing substantially 22 to 40 parts in a hundred parts by weight of the compound pentyl p-anisylidene p-aminophenyl carbonate, a substantial portion of the remainder being the compound p-ethoxybenzylidene p-n-butylaniline.
Claim 7
Dependent Claim
30 words
The composition described in claim 1 containing substantially 27.5 parts by weight of the compound pentyl p-anisylidene p-aminophenyl carbonate and substantially 72.5 parts by weight of the compound p-ethoxybenzylidene p-n-butylaniline.
Claim 8
Dependent Claim
19 words
The composition described in claim 2 to which is added substantially one per cent by weight of a p-n-alkoxyphenol.
Claim 9
Dependent Claim
14 words
An electro-optically active composition of materials consisting of: an alkoxybenzylidene p-n-butylaniline, and p-toluylidene p-n-butylaniline.
Claim 10
Dependent Claim
12 words
The composition described in claim 10 wherein the alkoxy radical is p-n-butoxy.
Claim 11
Dependent Claim
15 words
The composition described in claim 10 consisting of: p-n-butoxybenzylidene p-n-butylaniline as represented by the formula:
Claim 12
Dependent Claim
33 words
The composition described in claim 10 consisting of substantially 20 to 72 per cent by weight of the compound p-toluylidene p-n-butylaniline, a substantial portion of the remainder consisting of the compound p-n-butoxybenzylidene p-n-butylaniline.
Claim 13
Dependent Claim
33 words
The composition described in claim 10 consisting of substantially 36 to 82 per cent by weight of the compound p-toluylidene p-n-butylaniline, a substantial portion of the remainder consisting of the compound p-n-butoxybenzylidene p-n-butylaniline.
Claim 14
Dependent Claim
34 words
The composition described in claim 10 consisting of substantially 42 to 82 per cent by weight of the compound p-toluylidene p-n-butylaniline, A substantial portion of the remainder consisting of the compound p-n-butoxy benzylidene p-n-butylaniline.
Claim 15
Dependent Claim
19 words
The composition described in claim 10 to which is added substantially 1 per cent by weight of a p-n-alkoxyphenol.
Claim 16
Dependent Claim
48 words
An electro-optically active device comprising: container means for supporting a layer of electro-optically active material, and transparent electrode means constituting a portion of said container means for applying an electric field pattern across said active layer, said layer consisting of: an alkoxybenzylidene p-n-butylaniline, and pentyl p-anisylidene p-aminophenyl carbonate.
Claim 17
Dependent Claim
12 words
Apparatus as described in claim 17 wherein said layer includes p-ethoxybenzylidene p-n-butylaniline.
Claim 18
Dependent Claim
13 words
Apparatus as described in claim 18 wherein said layer additionally includes a p-n-alkoxyphenol.
Claim 19
Dependent Claim
46 words
An electro-optically active device comprising: container means for supporting a layer of electro-optically active material, and transparent electrode means constituting a portion of said container means for applying an electric field pattern across said active layer, said layer consisting of: an alkoxybenzylidene p-n-butylaniline, and p-toluylidene p-n-butylaniline.
Claim 20
Dependent Claim
12 words
The apparatus described in claim 20 wherein said layer includes p-n-butoxybenzylidene p-n-butylaniline.
Claim 21
Dependent Claim
13 words
The apparatus described in claim 21 wherein said layer additionally includes a p-n-alkoxyphenol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |