US3780307A
Expired / Lapsed
US
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Liquid crystalline compositions having induced optical activity
Assignee: Xerox Corp
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Filing: 1971-10-22
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Granted: 1973-12-18
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Expires: 1991-10-22
Abstract
Abstract The electronic transitions of extrinsically optically inactive materials become circularly dichroic when these materials are introduced into an optically negative liquid crystalline environment thereby providing unusual and highly advantageous properties in such compositions. The circularly dichroic optical properties induced in the normally extrinsically optically inactive materials can be utilized for imaging, optical filter and other related applications.
Inventors
- 👤 F Saeva
- 👤 J Wysocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/586; G02B; G02B5/00; G02B5/30; G02B5/3016
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
The method as defined in claim 1 wherein the angular relationship of the axes of polarization of said linear polarizer and said linear analyzer is about 90*.
Claim 2
Dependent Claim
22 words
The method as defined in claim 1 wherein said liquid crystal film is from about 0.5 to about 50 microns in thickness.
Claim 3
Dependent Claim
30 words
The method as defined in claim 1 wherein said light absorption band of at least one said extrinsically optically inactive material is in the visible region of the electromagnetic spectrum.
Claim 4
Dependent Claim
28 words
The method as defined in claim 1 wherein the extrinsically optically inactive additive material content of said liquid crystal film comprises up to about 60 percent by weight.
Claim 5
Dependent Claim
44 words
The method as defined in claim 1 wherein the extrinsically optically inactive additive material comprises a member selected from the group consisting of: aromatic compounds; azo compounds; nitro compounds; nitroso compounds; anil compounds; carbonyl compounds; thiocarbonyl compounds; alkenes; heterocyclic compounds; alkanes; and mixtures thereof.
Claim 6
Dependent Claim
28 words
The method as defined in claim 1 wherein the extrinsically optically inactive additive material content of said liquid crystal film comprises up to about 99 percent by weight.
Claim 7
Dependent Claim
34 words
The method as defined in claim 7 wherein said extrinsically optically inactive additive material comprises a member selected from the group consisting of smectic liquid crystalline substances, nematic liquid crystalline substances and mixtures thereof.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |