Patent US6305378B1 successfully refreshed from Google Patents.
US4293434A
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Liquid crystal compounds
Assignee: VEB WERK fur FERNSEHELEKTRONIK BERLIN IMVEB KOMINAT MIKROELEKTRONIK
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Filing: 1979-02-13
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Granted: 1981-10-06
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Expires: 1999-02-13
Abstract
Abstract The invention describes nematic compositions for electrooptical devices for modulation of the transmitted or incident light and for the rendition of numbers, symbols and images as orientation in the spectroscopy and gas chromatography. The compositions comprise, liquid crystalline compounds such as dyestuffs and at least one of the compound having the following general formula: ##STR1## wherein ##STR2##
Inventors
- 👤 Hans-Joachim Deutscher
- 👤 Herrmann Schubert
- 👤 Christina Seidel
- 👤 Dietrich Demus
- 👤 Horst Kresse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
Nematic composition for electro-optical devices for the modulation of transmitted or incident light and the rendition of numbers, symbols and images, or as orientation medium in spectroscopy and gas chromatography comprising liquid crystalline compounds, non-liquid crystalline dyestuffs and at least one compound having the following general formula: ##STR16## wherein R 1 equals C n H 2n+1 with n being 1 to 9; R 2 equals C n H 2n+1 - or C n H 2n+1 O- when X is ##STR17## and R 2 equals C n H 2n+1 O- or --CN when X is ##STR18## R 3 equals --CH 3 , --C 2 H 5 , --Cl or --Br; and R and R 4 each equals C n H 2n+1 or C n H 2n+1 O-, with n being 1 to 9 and ##STR19## represents cyclohexyl.
Claim 2
Dependent Claim
136 words
Nematic composition for electro-optical devices for the modulation of transmitted or incident light and the rendition of numbers, symbols and images, or as orientation medium in spectroscopy and gas chromatography comprising liquid crystalline compounds, non-liquid crystalline dyestuffs and at least one compound having the following general formula: ##STR16## wherein R 1 equals C n H 2n+1 with n being 1 to 9; R 2 equals C n H 2n+1 - or C n H 2n+1 O- when X is ##STR17## and R 2 equals C n H 2n+1 O- or --CN when X is ##STR18## R 3 equals --CH 3 , --C 2 H 5 , --Cl or --Br; and R and R 4 each equals C n H 2n+1 or C n H 2n+1 O-, with n being 1 to 9 and ##STR19## represents cyclohexyl.
Claim 3
Dependent Claim
6 words
The compound having the formula: ##STR20##
Claim 4
Dependent Claim
6 words
The compound having the formula: ##STR20##
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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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |