US5293261A
Expired / Lapsed
US
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Device for low electric-field induced switching of Langmuir-Blodgett ferroelecric liquid crystal polymer films
Assignee: United States, AS REPRESENTED BY SECRETARY TO NAVY
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Filing: 1992-12-31
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Granted: 1994-03-08
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Expires: 2012-12-31
Abstract
Abstract Devices in which a Langmuir-Blodgett film of a liquid crystal polymer is disposed between electrodes on the surface of a substrate exhibit fast ferroelectric switching in response to an electric field generated by the electrodes, and Langmuir-Blodgett films of a liquid crystal polymer exhibit pyroelectric properties even at thicknesses below 10-15 (my)m.
Inventors
- 👤 Ranganathan Shashidhar
- 👤 Jawad Naciri
- 👤 Sebastian Pfeiffer
- 👤 Thomas L. Fare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133365; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
40 words
A liquid crystal device comprising: (a) substrate; (b) at least one pair of electrodes disposed on said substrate; and (c) a Langmuir-Blodgett film of a liquid crystal polymer disposed on said substrate between said at least one pair of electrodes.
Claim 2
Dependent Claim
40 words
A liquid crystal device comprising: (a) substrate; (b) at least one pair of electrodes disposed on said substrate; and (c) a Langmuir-Blodgett film of a liquid crystal polymer disposed on said substrate between said at least one pair of electrodes.
Claim 3
Dependent Claim
23 words
The device of claim 1, wherein said substrate comprises a material selected from the group consisting of glass, quartz, silica, ceramics, and plastic.
Claim 4
Dependent Claim
22 words
The device of claim 1, wherein said electrodes comprise a material selected from the group consisting of gold, silver, copper, and aluminum.
Claim 5
Dependent Claim
10 words
The device of claim 1, wherein said electrodes comprise gold.
Claim 6
Dependent Claim
20 words
The device of claim 1, wherein said liquid crystal polymer is a liquid crystal polymer with side chain mesogenic groups.
Claim 7
Dependent Claim
151 words
The device of claim 1, wherein said liquid crystal polymer is a compound of the formula (I) ##STR13## wherein monomer a is present in an amount of 0.1 to 0.9 mole % and monomer b is present in an amount of 0.1 to 0.9 mole % and wherein R 1 is 1,4-phenylene or 4,4'-biphenylene; X is --COO-- or --OCO--; Y is ##STR14## and R 2 is ##STR15## in which k is 0 or 1; * denotes an optically active center; Z is NO 2 , F, or Cl; R 3 is C l H 2l+1 , --*CH(CH 3 )C p H 2p+1 --CH 2 C q F 2q+1 , --*CH(CH 3 )COOC t H 2t+1 (l and p are each independently an integer of from 1 to 10 and q and t are each independently an integer of from 1 to 6); and n is an integer of 4 to 12.
Claim 8
Dependent Claim
11 words
The device of claim 6, wherein the ratio b/(a+b)=0.2 to 0.8.
Claim 9
Dependent Claim
11 words
The device of claim 6, wherein the ratio b/(a+b)=0.2 to 0.4.
Claim 10
Dependent Claim
19 words
The device of claim 6, wherein the said liquid crystal polymer has a DP n of 5 to 75.
Claim 11
Dependent Claim
19 words
The device of claim 1, wherein said Langmuir-Blodgett film comprises 1 to 120 layers of said liquid crystal polymer.
Claim 12
Dependent Claim
19 words
The device of claim 1, wherein said Langmuir-Blodgett film comprises 5 to 50 layers of said liquid crystal polymer.
Claim 13
Dependent Claim
39 words
An infrared detector, comprising: (a) substrate; (b) at least one pair of electrodes disposed on said substrate; and (c) a Langmuir-Blodgett film of a liquid crystal polymer disposed on said substrate between said at least one pair of electrodes.
Claim 14
Dependent Claim
39 words
An infrared detector, comprising: (a) substrate; (b) at least one pair of electrodes disposed on said substrate; and (c) a Langmuir-Blodgett film of a liquid crystal polymer disposed on said substrate between said at least one pair of electrodes.
Claim 15
Dependent Claim
22 words
The detector of claim 12, wherein said electrodes comprise a material selected from the group consisting of gold, silver, copper, and aluminum.
Claim 16
Dependent Claim
10 words
The detector of claim 12, wherein said electrodes comprise gold.
Claim 17
Dependent Claim
20 words
The detector of claim 12, wherein said liquid crystal polymer is a liquid crystal polymer with side chain mesogenic groups.
Claim 18
Dependent Claim
151 words
The detector of claim 12, wherein said liquid crystal polymer is a compound of the formula (I) ##STR16## wherein monomer a is present in an amount of 0.1 to 0.9 mole % and monomer b is present in an amount of 0.1 to 0.9 mole % and wherein R 1 is 1,4-phenylene or 4,4'-biphenylene; X is --COO-- or --OCO--; Y is ##STR17## and R 2 is ##STR18## in which k is 0 or 1; * denotes an optically active center; Z is NO 2 , F, or Cl; R 3 is C l H 2l+1 , --*CH(CH 3 )C p H 2p+1 --CH 2l C q F 2q+1 , --*CH(CH 3 )COOC t H 2t+1 (l and p are each independently an integer of from 1 to 10 and q and t are each independently an integer of from 1 to 6); and n is an integer of 4 to 12.
Claim 19
Dependent Claim
11 words
The detector of claim 16, wherein the ratio b/(a+b)=0.2 to 0.8.
Claim 20
Dependent Claim
11 words
The detector of claim 16, wherein the ratio b/(a+b)=0.2 to 0.4.
Claim 21
Dependent Claim
19 words
The detector of claim 16, wherein the said liquid crystal polymer has a DP n of 5 to 75.
Claim 22
Dependent Claim
19 words
The detector of claim 12, wherein said Langmuir-Blodgett film comprises 1 to 120 layers of said liquid crystal polymer.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-03-07 | 1997-09-06 | 1998-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-07 | 2001-09-06 | 2002-03-08 | $3760.00 | Window Closed / Lapsed |
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