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US5361152A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for producing ferroelectric liquid-crystal cells

Assignee: Hoechst AG
•
Filing: 1991-06-14
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Granted: 1994-11-01
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Expires: 2011-06-14
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Abstract

Abstract A process for producing a liquid-crystal cell which comprises the steps of: (a) providing a curable sealant portion in the periphey of the side of an electrode plate that has an electrode or electrodes; (b) (i) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion, with a spacer being preliminarily provided in said portion; (ii) coating spacer-containing ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion; or (iii) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion and thereafter providing a spacer over said composition; (c) defoaming the coated layer of the liquid-crystal composition by heating during or after evacuation; (d) placing the other electrode plate in such a way that the side of said other electrode plate which has an electrode or electrodes faces the side of said one electrode plate containing the thermally defoamed coated layer of the liquid-crystal composition and compressing the two electrode plates together; and (e) curing said sealant.

Inventors

  • 👤 Takamasa Harada
  • 👤 Claus Escher
  • 👤 Gerhard Illian
  • 👤 Dieter Ohlendorf
  • 👤 Heinz Rieger
  • 👤 Norbert Rosch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 00:12
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1341

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 185 words
A process for producing a liquid-crystal cell which comprises the steps of: (a) providing a curable sealant portion in the periphey of the side of an electrode plate that has an electrode or electrodes; (b) (i) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion, with a spacer being preliminarily provided in said portion; or (ii) coating a spacer-containing ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion; or (iii) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion and thereafter providing a spacer over said composition; (c) defoaming the coated layer of the liquid-crystal composition by heating the coated plate during or after evacuation up to the temperature at which the liquid-crystal composition exhibits an isotropic liquid or nematic phase; (d) placing the other electrode plate in such a way that the side of said other electrode plate which has an electrode or electrodes faces the side of said one electrode plate containing the thermally defoamed coated layer of the liquid-crystal composition and compressing the two electrode plates together; and (e) curing said sealant.
Claim 2
Dependent Claim 185 words
A process for producing a liquid-crystal cell which comprises the steps of: (a) providing a curable sealant portion in the periphey of the side of an electrode plate that has an electrode or electrodes; (b) (i) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion, with a spacer being preliminarily provided in said portion; or (ii) coating a spacer-containing ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion; or (iii) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion and thereafter providing a spacer over said composition; (c) defoaming the coated layer of the liquid-crystal composition by heating the coated plate during or after evacuation up to the temperature at which the liquid-crystal composition exhibits an isotropic liquid or nematic phase; (d) placing the other electrode plate in such a way that the side of said other electrode plate which has an electrode or electrodes faces the side of said one electrode plate containing the thermally defoamed coated layer of the liquid-crystal composition and compressing the two electrode plates together; and (e) curing said sealant.
Claim 3
Dependent Claim 19 words
A process according to claim 1 which further includes the step of heating the liquid-crystal cell after step (e).

References Cited (Backward Citations)

EP0113064A1 Cited
JPS61116326A Cited
US4691995A Cited
EP0292244A2 Cited
US4917473A Cited
WO1990000263A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1997-10-31 1998-05-02 1998-11-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-10-31 2002-05-02 2002-11-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-10-31 2006-05-02 2006-11-01 $7700.00 Window Closed / Lapsed

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