US4000084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal mixtures for electro-optical display devices
Assignee: Raytheon Co
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Filing: 1973-12-17
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Granted: 1976-12-28
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Expires: 1993-12-17
Abstract
Abstract This invention is directed to liquid crystal mixtures which have an extended operating range and require a low operating voltage. They are white in color and stable to atmospheric oxygen, moisture, and light. Because of their superior properties, they are useful in electro-optical displays, especially in liquid crystal watches and pocket-size calculators.
Inventors
- 👤 Paul Y. Hsieh
- 👤 Yat-Shir Lee
- 👤 John E. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:59
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K2019/2035
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
33 words
A mixture having nematic liquid crystal properties consisting essentially of (a) at least two nematic p-cyanophenyl-p-n-alkyl benzoates dissolved in (b) a p-n-alkylphenyl-p-n-alkylbenzoate wherein each alkyl has from 1 to about 8 carbon atoms.
Claim 2
Dependent Claim
33 words
A mixture having nematic liquid crystal properties consisting essentially of (a) at least two nematic p-cyanophenyl-p-n-alkyl benzoates dissolved in (b) a p-n-alkylphenyl-p-n-alkylbenzoate wherein each alkyl has from 1 to about 8 carbon atoms.
Claim 3
Dependent Claim
16 words
A mixture of claim 1 wherein (a) is a mixture of p-cyanophenyl-p-n-butyl benzoate and p-cyanophenyl-p-n-heptyl benzoate.
Claim 4
Dependent Claim
9 words
A mixture of claim 2 wherein (b) is p-n-butylphenyl-p-toluate.
Claim 5
Dependent Claim
6 words
A eutectic mixture of claim 2.
Claim 6
Dependent Claim
6 words
A eutectic mixture of claim 3.
Claim 7
Dependent Claim
37 words
A mixture having nematic liquid crystal properties consisting essentially of (a) at least two nematic p-cyanophenyl-p-n-alkyl benzoates, and (c) a p-n-alkylphenyl-p-(p-n-alkylbenzoyloxy)-benzoate dissolved in (b) a p-n-alkylphenyl-p-n-alkylbenzoate wherein each alkyl has from 1 to about 8 carbon atoms.
Claim 8
Dependent Claim
37 words
A mixture having nematic liquid crystal properties consisting essentially of (a) at least two nematic p-cyanophenyl-p-n-alkyl benzoates, and (c) a p-n-alkylphenyl-p-(p-n-alkylbenzoyloxy)-benzoate dissolved in (b) a p-n-alkylphenyl-p-n-alkylbenzoate wherein each alkyl has from 1 to about 8 carbon atoms.
Claim 9
Dependent Claim
16 words
A mixture of claim 6 wherein (a) is a mixture of p-cyanophenyl-p-n-butyl benzoate and p-cyanophenyl-p-n-heptyl benzoate.
Claim 10
Dependent Claim
9 words
A mixture of claim 7 wherein (b) is p-n-butylphenyl-p-toluate.
Claim 11
Dependent Claim
9 words
A mixture of claim 8 wherein (c) is p-n-butylphenyl-p-(p-n-butylbenzoyloxy)-benzoate.
Claim 12
Dependent Claim
6 words
A eutectic mixture of claim 7.
Claim 13
Dependent Claim
6 words
A eutectic mixture of claim 9.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |