US4643841A
Expired / Lapsed
US
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Liquid-crystal composition
Assignee: Merck Patent GmbH
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Filing: 1984-08-21
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Granted: 1987-02-17
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Expires: 2004-08-21
Abstract
Abstract A liquid-crystal composition to be used in a multiplex-driving system in a twisted nematic (TN) type liquid-crystal display devices of the present invention is extremely superior in its display characteristics, and is able to meet sufficiently the demands to increase the information content of various liquid-crystal display devices of high-level multiplexing operation. The liquid-crystal composition is more considerable in its usefulness than the validity thereof in half-tone display especially when it is used in a liquid-crystal television.
Inventors
- 👤 Yutaka Ishii
- 👤 Fumiaki Funada
- 👤 Masataka Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:21
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/06; C09K19/08; C09K19/30; C09K19/3001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A mixed nematic liquid-crystal composition comprising: a 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound of the formula: ##STR74## wherein R 1 =C n H 2n+1 , R 2 =C m H 2m+1 , n=1-12, and m=1-12; a cyanobiphenyl compound which is a member selected from the group consisting of: ##STR75## wherein n=1 through 7; at least one compound which is a member selected from the group consisting of: ##STR76## wherein R 1 through R 8 represent a straight-chain alkyl group having 1 through 6 carbon atoms and R 3 ' and R 6 ' represent straight chain alkoxy groups having 1 to 6 carbon atoms; at least one compound which is a member selected from the group consisting of: ##STR77## wherein R 9 through R 14 represent a straight-chain alkyl group having 1 through 10 carbon atoms; and at least one compound which is a member selected from the group consisting of: ##STR78## wherein R 15 through R 22 represent a straight-chain alkyl group having 1 to 10 carbon atoms.
Claim 2
Dependent Claim
165 words
A mixed nematic liquid-crystal composition comprising: a 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound of the formula: ##STR74## wherein R 1 =C n H 2n+1 , R 2 =C m H 2m+1 , n=1-12, and m=1-12; a cyanobiphenyl compound which is a member selected from the group consisting of: ##STR75## wherein n=1 through 7; at least one compound which is a member selected from the group consisting of: ##STR76## wherein R 1 through R 8 represent a straight-chain alkyl group having 1 through 6 carbon atoms and R 3 ' and R 6 ' represent straight chain alkoxy groups having 1 to 6 carbon atoms; at least one compound which is a member selected from the group consisting of: ##STR77## wherein R 9 through R 14 represent a straight-chain alkyl group having 1 through 10 carbon atoms; and at least one compound which is a member selected from the group consisting of: ##STR78## wherein R 15 through R 22 represent a straight-chain alkyl group having 1 to 10 carbon atoms.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |