Patent US5589237A successfully refreshed from Google Patents.
US5589237A
Expired / Lapsed
US
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Reversible display medium
Assignee: Fujifilm Business Innovation Corp
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Filing: 1994-06-21
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Granted: 1996-12-31
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Expires: 2014-06-21
Abstract
Abstract A reversible display medium comprising substrate 1 having thereon recording layer 2 containing a side chain type high polymeric liquid crystal capable of repeatedly and reversibly switching between a transparent state and a light-scattered state by the action of heat, an electrical field or a magnetic field, wherein said side chain type high polymeric liquid crystal is a copolymer comprising at least one liquid crystal monomer unit and at least one non-liquid crystal monomer unit having a hydrogen bond-forming substituent, e.g., a hydroxyl group, a carboxyl group, a sulfonic group or a phosphoric group. The display medium is excellent in durability on repeated use, heat sensitivity, display contrast, and record preservability.
Inventors
- 👤 Ryojiro Akashi
- 👤 Takashi Morikawa
- 👤 Masanobu Ninomiya
- 👤 Takashi Uematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:07
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; C09K2323/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133365; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A reversible display medium comprising a substrate having a recording layer containing a side chain polymeric liquid crystal repeatedly switchable between a transparent state and a light-scattered state by the action of at least one of heat, an electrical field, and a magnetic field, wherein said side chain polymeric liquid crystal is a copolymer comprising at least a repeating unit derived from a liquid crystal monomer and a repeating unit derived from a non-liquid crystal monomer having a hydrogen bond-forming substituent, said side chain polymeric liquid crystal has a multi-domain structure in which the domain diameter at the maximum of the domain number distribution is not greater than 3 μm.
Claim 2
Dependent Claim
110 words
A reversible display medium comprising a substrate having a recording layer containing a side chain polymeric liquid crystal repeatedly switchable between a transparent state and a light-scattered state by the action of at least one of heat, an electrical field, and a magnetic field, wherein said side chain polymeric liquid crystal is a copolymer comprising at least a repeating unit derived from a liquid crystal monomer and a repeating unit derived from a non-liquid crystal monomer having a hydrogen bond-forming substituent, said side chain polymeric liquid crystal has a multi-domain structure in which the domain diameter at the maximum of the domain number distribution is not greater than 3 μm.
Claim 3
Dependent Claim
28 words
The reversible display medium as claimed in claim 1, wherein said copolymer further comprises a repeating unit derived from a non-liquid crystal monomer having no hydrogen bond-forming substituent.
Claim 4
Dependent Claim
28 words
The reversible display medium as claimed in claim 1, wherein said hydrogen bond-forming substituent is a carboxyl group, a sulfonic group, a phosphoric group or a hydroxy group.
Claim 5
Dependent Claim
19 words
The reversible display medium as claimed in claim 1, further including a protective layer provided on said recording layer.
Claim 6
Dependent Claim
20 words
The reversible display medium as claimed in claim 4, wherein said protective layer includes a polymeric compound and inorganic particles.
Claim 7
Dependent Claim
17 words
The reversible display medium as claimed in claim 5, wherein said polymeric compound includes a thermosetting resin.
Claim 8
Dependent Claim
20 words
The reversible display medium as claimed in claim 4, wherein said protective layer also serves as a reflection preventive layer.
Claim 9
Dependent Claim
25 words
The reversible display medium as claimed in claim 1, further including a layer, which is writable on with a pencil, provided on said recording layer.
Claim 10
Dependent Claim
22 words
The reversible display medium as claimed in claim 8, wherein said layer which is writable on with a pencil includes inorganic particles.
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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) | 1999-12-31 | 2000-07-01 | 2000-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-31 | 2004-07-01 | 2004-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-31 | 2008-07-01 | 2008-12-31 | $7700.00 | Window Closed / Lapsed |