US3915883A
Expired / Lapsed
US
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Liquid crystalline compounds and compositions
Assignee: Eastman Kodak Co
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Filing: 1973-08-15
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Granted: 1975-10-28
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Expires: 1993-08-15
Abstract
Abstract Liquid crystalline materials comprised of substituted phenyl pbenzoyloxybenzoates are useful in electro-optical elements. These materials have low crystal to mesophase transition temperatures and have a broad mesophase temperature range.
Inventors
- 👤 James P Vanmeter
- 👤 Bruce H Klanderman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
IN AN ELECTRO-OPTICAL CELL COMPRISING MEANS CONTAINING A FILM OF AT LEAST ONE LIQUID CRYSTALLINE COMPOUND AND MEANS FOR APPLYING AN ELECTRIC FIELD TO SAID FILM, SAID FIELD BEING OF SUFFICIENT MAGNITUDE TO ALTER THE LIGHT MODULATION PROPERTIES OF SAID FILM, THE IMPROVEMENT SAID COMPOUND IS A SUBSTITUTED PHENYL P-BENZOYLOXYBENZOATE HAVING (A) A MESOMORPHIC TEMPERATURE RANGE OF GREATER THAN ABOUT 50*C, AND/OR (B) A CRYSTAL TO MESOPHASE TRANSITION TEMPERAURE LOWER THAN ABOUT 100*C, SAID COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
78 words
IN AN ELECTRO-OPTICAL CELL COMPRISING MEANS CONTAINING A FILM OF AT LEAST ONE LIQUID CRYSTALLINE COMPOUND AND MEANS FOR APPLYING AN ELECTRIC FIELD TO SAID FILM, SAID FIELD BEING OF SUFFICIENT MAGNITUDE TO ALTER THE LIGHT MODULATION PROPERTIES OF SAID FILM, THE IMPROVEMENT SAID COMPOUND IS A SUBSTITUTED PHENYL P-BENZOYLOXYBENZOATE HAVING (A) A MESOMORPHIC TEMPERATURE RANGE OF GREATER THAN ABOUT 50*C, AND/OR (B) A CRYSTAL TO MESOPHASE TRANSITION TEMPERAURE LOWER THAN ABOUT 100*C, SAID COMPOUND HAVING THE FORMULA:
Claim 3
Dependent Claim
89 words
In an electro-optical cell in accordance with claim 1 wherein in said formula: one of R1 and R2 is an alkyl group having 1 to about 12 carbon atoms or a cyano group and the other of R1 and R2 is an alkyl group having about 1 to 12 carbon atoms or an alkoxy group having 1 to about 12 carbon atoms in the alkyl moiety; and at least one of R3, R4, R5, R6, R7, and R8 is a halogen atom and the remaining substituents are hydrogen atoms.
Claim 4
Dependent Claim
70 words
In an electro-optical cell in accordance with claim 1 wherein in said formula: one of R1 and R2 is an alkyl group or cyano group and the other is an alkyl or alkoxy group; and at least one of R3, R4, R5, R6, R7 and R8 is a cyano group and the remaining substituents are selected from a hydrogen atom, a methyl group, a nitro group or a halogen atom.
Claim 5
Dependent Claim
55 words
In an electro-optical cell in accordance with claim 2 wherein in said formula: R1 is an alkyl group having about 4 to 8 carbon atoms; R2 is an alkyl group having abOut 4 to 8 carbon atoms or an alkoxy group having about 4 to 8 carbon atoms; and only R5 is a halogen atom.
Claim 6
Dependent Claim
62 words
In an electro-optical cell comprising means containing a film of a liquid crystalline material and means for applying an electric field to said film, said field being of sufficient magnitude to alter the light modulation properties of said film, the improvement wherein said material comprises a mixture of (a) about 35 to 65% by weight of a first compound having the formula:
Claim 7
Dependent Claim
62 words
In an electro-optical cell comprising means containing a film of a liquid crystalline material and means for applying an electric field to said film, said field being of sufficient magnitude to alter the light modulation properties of said film, the improvement wherein said material comprises a mixture of (a) about 35 to 65% by weight of a first compound having the formula:
Claim 8
Dependent Claim
28 words
The invention as described in claim 5 wherein said material additionally comprises up to about 30% by weight of at least one substituted phenyl benzoate of the formula:
Claim 9
Dependent Claim
65 words
In an electro-optical cell comprising means containing a film of a liquid crystalline material and means for applying an electric field to said film, said field being of sufficient magnitude to alter the light modulation properties of said film, the improvement wherein said material comprises a mixture of (a) about 5 to 70% by weight of at least one substituted phenyl benzoate of the formula:
Claim 10
Dependent Claim
65 words
In an electro-optical cell comprising means containing a film of a liquid crystalline material and means for applying an electric field to said film, said field being of sufficient magnitude to alter the light modulation properties of said film, the improvement wherein said material comprises a mixture of (a) about 5 to 70% by weight of at least one substituted phenyl benzoate of the formula:
Claim 11
Dependent Claim
24 words
A liquid crystalline composition comprising about 35 to 65% by weight of 4-octylphenyl p-2-chloro-4-(4-heptylbenzoyloxy)benzoate and about 65 to 35% by weight of 4-pentylphenyl 2-chloro-4-(4-pentylbenzoyloxy)benzoate.
Claim 12
Dependent Claim
24 words
A liquid crystalline composition comprising about 35 to 65% by weight of 4-octylphenyl p-2-chloro-4-(4-heptylbenzoyloxy)benzoate and about 65 to 35% by weight of 4-pentylphenyl 2-chloro-4-(4-pentylbenzoyloxy)benzoate.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |