US4279770A
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Liquid crystal 2,3-dicyano-hydroquinone derivatives
Assignee: JNC Corp
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Filing: 1979-09-12
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Granted: 1981-07-21
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Expires: 1999-09-12
Abstract
Abstract Liquid crystal materials for liquid crystal display, having a large negative dielectric anisotropy and maintaining a liquid crystal state at a broad temperature range including room temperature are provided. These materials contain novel compounds expressed by the general formula (I) ##STR1## wherein X represents ##STR2## Y represents ##STR3## R 1 and R 3 each represent an alkyl group or an alkyloxy group of 1-10 carbon atoms; R 2 and R 4 each represent an alkyl group of 1-10 carbon atoms; but compounds wherein ##STR4## are excluded.
Inventors
- 👤 Takashi Inukai
- 👤 Hiromichi Inoue
- 👤 Kenji Furukawa
- 👤 Hideo Sato
- 👤 Shigeru Sugimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:10
CPC Classifications
C; C07; C07C; C07C255/00; A; A01; A01N; A01N33/00; A01N33/16; A01N33/18; A01N33/20; A01N33/22; A01N37/00; A01N37/52; C07D; C07D295/00; C07D295/04; C07D295/06; C07D295/073; C07D295/08; C07D295/096; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K19/32; C09K19/322
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
37 words
Compounds expressed by the general formula (I) ##STR42## R 1 and R 3 each represent an alkyl group or an alkyloxy group of 1-10 carbon atoms; and R 4 represents an alkyl group of 1-10 carbon atoms.
Claim 2
Dependent Claim
37 words
Compounds expressed by the general formula (I) ##STR42## R 1 and R 3 each represent an alkyl group or an alkyloxy group of 1-10 carbon atoms; and R 4 represents an alkyl group of 1-10 carbon atoms.
Claim 3
Dependent Claim
11 words
Compounds according to claim 1 wherein ##STR43## and Y=R 4 .
Claim 4
Dependent Claim
7 words
Compounds according to claim 1 wherein ##STR44##
Claim 5
Dependent Claim
15 words
Compounds according to claim 1 wherein ##STR45## and Y=R 4 --O--CH 2 CH 2 .
Claim 6
Dependent Claim
11 words
Compounds according to claim 1 wherein ##STR46## and Y=R 4 .
Claim 7
Dependent Claim
15 words
Compounds according to claim 1 wherein ##STR47## and Y=R 4 --O--CH 2 CH 2 .
Claim 8
Dependent Claim
22 words
Liquid crystal compositions comprising at least one compound of the general formula (I) of claim 1, and having a negative dielectric anisotropy.
Claim 9
Dependent Claim
24 words
Liquid crystal compositions comprising at least one compound of formula (I) of claim 1, and having a negative dielectric anisotropy of -3 or less.
Claim 10
Dependent Claim
40 words
Liquid crystal display elements obtained by adding 0.5 to 3.0% by weight of a dye having a positive dichroism to the liquid crystal compositions of claim 7 or claim 8 to thereby utilize the guest-host effect of the resulting mixture.
Claim 11
Dependent Claim
40 words
Liquid crystal display elements obtained by adding dye having a positive dichroism and a dye having a negative dichroism to the liquid crystal compositions of claim 7 or claim 8 to thereby utilize the guest-host effect of the resulting mixture.
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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |