US4066569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dopants for dynamic scattering liquid crystals
Assignee: Raytheon Co
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Filing: 1975-12-30
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Granted: 1978-01-03
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Expires: 1995-12-30
Abstract
Abstract Metallocenes when mixed with conjugated cyano-organic compounds such as 7,7'8,8'-tetracyanoquinodimethane (TCNQ) and (2,4,7,-trinitro-9-fluorenylidene)-malononitrile (TFM) function as excellent dopants for liquid crystals.
Inventors
- 👤 Hong Sup Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A doped liquid crystal combination suitable for dc DSM and storage scattering applications comprised of a metallocene formed from a metal selected from the group consisting of Fe, Ru, and Os and (2,4,7-trinitro-9-fluorenylidene)-malononitrile dissolved in a nematic liquid crystal, nematic liquid crystal mixture, or cholesteric-nematic liquid crystal mixture.
Claim 2
Dependent Claim
48 words
A doped liquid crystal combination suitable for dc DSM and storage scattering applications comprised of a metallocene formed from a metal selected from the group consisting of Fe, Ru, and Os and (2,4,7-trinitro-9-fluorenylidene)-malononitrile dissolved in a nematic liquid crystal, nematic liquid crystal mixture, or cholesteric-nematic liquid crystal mixture.
Claim 3
Dependent Claim
21 words
The combination of claim 1 wherein said metallocene is taken from the group of compounds consisting of ferrocene and substituted ferrocenes.
Claim 4
Dependent Claim
10 words
The combination of claim 1 wherein said metallocene is ferrocene.
Claim 5
Dependent Claim
48 words
The combination of claim 1 wherein said metallocene is a mono-substituted ferrocene whose general structural formula is ##STR1## and R is an organic group of the formula C n H 2n+1 X where n ranges from 1 to 20 and X may be CH 2 , O, ##STR2##
Claim 6
Dependent Claim
50 words
The combination of claim 1 wherein said metallocene is a di-substituted ferrocene whose general structural formula is ##STR3## and both R' and R are organic groups of the formula C n H 2n+1 X where n ranges from 1 to 20 and X may be CH 2 , O, ##STR4##
Claim 7
Dependent Claim
10 words
The combination of claim 4 wherein said ferrocene is n-butyl-ferrocene.
Claim 8
Dependent Claim
10 words
The combination of claim 5 wherein said ferrocene is di-n-butyl-ferrocene.
Claim 9
Dependent Claim
32 words
The combination of claim 1 wherein said dopant is dissolved in a nematic liquid crystal or a mixture of liquid crystals taken from the group of compounds consisting of phenyl benzoate esters.
Claim 10
Dependent Claim
31 words
The combination of claim 1 wherein the concentration of said dopant is less than 1% of the weight of said nematic liquid crystal, nematic crystal mixture, or cholesteric-nematic liquid crystal mixture.
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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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |