US3876286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of nematic liquid crystalline substances
Assignee: Werk fuer Fernsehelektronik GmbH
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Filing: 1972-06-14
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Granted: 1975-04-08
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Expires: 1992-06-14
Abstract
Abstract In a system comprising means for generating an electric or magnetic field and a composition comprising a nematic liquid crystalline compound retained in the field, the improvement in which the nematic liquid crystalline compound is In which R.sub.1 is -- OC.sub.n H.sub.2n.sub.+1, -- C.sub.n H.sub.2n.sub.+1, or And R.sub.2 is -- OC.sub.n H.sub.2n.sub.+1 or -- C.sub.n H.sub.2n.sub.+1 and each occurrence of n is an individually selected integer of 1 to 12.
Inventors
- 👤 Hans-Joachim Deutscher
- 👤 Wolfgang Weissflog
- 👤 Dietrich Demus
- 👤 Gerhard Pelzl
- 👤 Hermann Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:00
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
IN A SYSTEM COMPRISING MEANS FOR GENERATING AN ELECTRIC OR MAGNETIC FIELD AND A COMPOSITION COMPRISING A NEMATIC LIQUID CRYSTALLINE COMPOUND RETAINED IN THE FIELD THE IMPROVEMENT IN WHICH THE NEMATIC LIQUID CRYSTALLINE COMPOUND IS
Claim 2
Dependent Claim
35 words
IN A SYSTEM COMPRISING MEANS FOR GENERATING AN ELECTRIC OR MAGNETIC FIELD AND A COMPOSITION COMPRISING A NEMATIC LIQUID CRYSTALLINE COMPOUND RETAINED IN THE FIELD THE IMPROVEMENT IN WHICH THE NEMATIC LIQUID CRYSTALLINE COMPOUND IS
Claim 3
Dependent Claim
59 words
In a system according to claim 1, in which the composition comprises a mixture of at least two of said nematic liquid crystalline compounds, the mixture having a lower melting point than the individual compounds and, hence, a broader temperature range in which the nematic liquid crystalline state exists, said melting point being no higher than about room temperature.
Claim 4
Dependent Claim
35 words
In a system according to claim 1, in which the system further comprises a non-liquid crystal substance, said substance being oriented with the nematic liquid crystalline compound when the electric or magnetic field is generated.
Claim 5
Dependent Claim
51 words
In a system according to claim 1, in which the system is electro-optical and includes means for varying at least portions of the field thereby to vary the light permeability or light scattering of the nematic liquid crystal compound and in the compound R.sub.1 and R.sub.2 are each -- OC.sub.n H.sub.2n+1.
Claim 6
Dependent Claim
18 words
In a system according to claim 4, in which the composition further comprises a compound of the formula
Claim 7
Dependent Claim
59 words
In a system according to claim 1, in which R.sub.1 is C.sub.n H.sub.2n+1 -- O-- or C.sub.n H.sub.2n+1 and R.sub.2 is -- C.sub.n H.sub.2n+1, and the composition further comprises a dichroitic compound selected from the group consisting of methyl red (Color Index No. 13020), Biebric Scarlet BPC (Color Index No. 25105), Indophenol Blue (Color Index No. 49700) and N,N''-dimethylindigo.
References Cited (Backward Citations)
US3597044A
Cited
US3625591A
Cited
US3689525A
Cited
US3690745A
Cited
US3790498A
Cited
US3772209A
Cited
US3772210A
Cited
US3826757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |