US3965030A
Expired / Lapsed
US
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Lyotropic nematic liquid crystals for use in electro-optical display devices
Assignee: Texas Instruments Inc
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Filing: 1972-08-07
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Granted: 1976-06-22
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Expires: 1992-08-07
Abstract
Abstract A display device in which a thin layer of a lyotropic nematic mesomorphic composition is utilized to diffuse light from a source toward an observer by applying a suitable voltage, for example, 20 volts for one mil layer. One form of the device transmits light through the layer. A second form of the device uses light diffused and reflected to the observer. A preferred lyotropic nematic mesomorphic composition includes three compounds of the structural formulae: ##SPC1## ##SPC2##
Inventors
- 👤 Derick Jones
- 👤 Sun Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:01
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/48
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A mixed liquid crystal composition consisting essentially of a mixture of a. a solvent having the general formula ##SPC16## wherein R 1 and R 2 are alkyl radicals having from 1 to 5 carbon atoms; and b. a solute selected from at least one compound or a mixture of both compounds taken from the group of compounds consisting of 1. butyl - p - (p-ethoxyphenoxycarbonyl) phenyl carbonate, and 2. p - [N-(p-methoxybenzylidene) amino] phenyl acetate.
Claim 2
Dependent Claim
75 words
A mixed liquid crystal composition consisting essentially of a mixture of a. a solvent having the general formula ##SPC16## wherein R 1 and R 2 are alkyl radicals having from 1 to 5 carbon atoms; and b. a solute selected from at least one compound or a mixture of both compounds taken from the group of compounds consisting of 1. butyl - p - (p-ethoxyphenoxycarbonyl) phenyl carbonate, and 2. p - [N-(p-methoxybenzylidene) amino] phenyl acetate.
Claim 3
Dependent Claim
22 words
A mixed liquid crystal composition as set forth in claim 1, wherein said solute consists of a mixture of both said compounds.
Claim 4
Dependent Claim
44 words
A mixed liquid crystal composition consisting essentially of a mixture of a. a solvent consisting of p-[N- (p-methylbenzylidene) amino] n-butyl benzene; and b. a solute consisting of a mixture of: 1. butyl - p - (p-ethoxyphenoxycarbonyl) phenyl carbonate, and 2. p-[N-(p-methoxybenzylidene) amino] phenyl acetate.
Claim 5
Dependent Claim
44 words
A mixed liquid crystal composition consisting essentially of a mixture of a. a solvent consisting of p-[N- (p-methylbenzylidene) amino] n-butyl benzene; and b. a solute consisting of a mixture of: 1. butyl - p - (p-ethoxyphenoxycarbonyl) phenyl carbonate, and 2. p-[N-(p-methoxybenzylidene) amino] phenyl acetate.
Claim 6
Dependent Claim
32 words
A mixed liquid crystal composition as set forth in claim 3, wherein the mixture of said solute consists of about 80 weight percent of (1) and about 20 weight percent of (2).
Claim 7
Dependent Claim
32 words
A mixed liquid crystal composition as set forth in claim 4, wherein about 60 mole percent of said solvent is mixed with about 40 mole percent of the mixture of said solute.
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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |