US5260254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information memory and display medium
Assignee: Ricoh Co Ltd
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Filing: 1990-06-15
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Granted: 1993-11-09
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Expires: 2010-06-15
Abstract
Abstract An information memory and display medium comprising: (a) a support, (b) a magnetic recording layer formed on the support, (c) a thermosensitive recording layer formed on the magnetic recording layer, which comprises (i) a light reflection layer formed on the magnetic recording layer, and (ii) a reversible thermosensitive recording layer formed on the light reflection layer, comprising a matrix resin, and one or more organic low-molecular-weight compounds dispersed in the matrix resin, with the transparency thereof being reversibly changeable between a transparent state and an opaque state depending upon the temperature thereof, thereby capable of yielding thermally erasable images. The thermosensitive recording layer may further comprise a smoothing layer between the magnetic recording layer and the light reflection layer, and/or an overcoat layer on the reversible thermosensitive recording layer.
Inventors
- 👤 Yoshihiko Hotta
- 👤 Toru Nogiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/36; B41M5/363
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
An information memory and display medium comprising: (a) a support, (b) a magnetic recording layer formed on said support, (c) a thermosensitive recording layer formed on said magnetic recording layer, which comprises (i) a light reflection layer formed on said magnetic recording layer, and (ii) a reversible thermosensitive recording layer formed on said light reflection layer, comprising a matrix resin, and one or more organic low-molecular-weight compounds dispersed in said matrix resin, with the transparency thereof being reversibly changeable between a transparent state and an opaque state depending upon the temperature thereof, thereby capable of yielding thermally erasable images.
Claim 2
Dependent Claim
99 words
An information memory and display medium comprising: (a) a support, (b) a magnetic recording layer formed on said support, (c) a thermosensitive recording layer formed on said magnetic recording layer, which comprises (i) a light reflection layer formed on said magnetic recording layer, and (ii) a reversible thermosensitive recording layer formed on said light reflection layer, comprising a matrix resin, and one or more organic low-molecular-weight compounds dispersed in said matrix resin, with the transparency thereof being reversibly changeable between a transparent state and an opaque state depending upon the temperature thereof, thereby capable of yielding thermally erasable images.
Claim 3
Dependent Claim
27 words
The information memory and display medium as claimed in claim 1, wherein said thermosensitive recording layer further comprises an overcoat layer on said reversible thermosensitive recording layer.
Claim 4
Dependent Claim
34 words
The information memory and display medium as claimed in claim 2, wherein said thermosensitive recording layer further comprises an intermediate layer which is interposed between said reversible thermosensitive recording layer and said overcoat layer.
Claim 5
Dependent Claim
40 words
The information memory and display medium as claimed in claim 1, wherein said thermosensitive recording layer further comprises a smoothing layer comprising an ultraviolet-ray- or electron-ray-cured resin, which is interposed between said magnetic recording layer and said light reflection layer.
Claim 6
Dependent Claim
27 words
The information memory and display medium as claimed in claim 4, wherein said thermosensitive recording layer further comprises an overcoat layer on said reversible thermosensitive recording layer.
Claim 7
Dependent Claim
34 words
The information memory and display medium as claimed in claim 5, wherein said thermosensitive recording layer further comprises an intermediate layer which is interposed between said reversible thermosensitive recording layer and said overcoat layer.
Claim 8
Dependent Claim
25 words
The information memory and display medium as claimed in claim 4, wherein said smoothing layer has a thickness ranging from 0.2 μm to 3.0 μm.
Claim 9
Dependent Claim
50 words
The information memory and display medium as claimed in claim 1, wherein said thermosensitive recording layer has a thickness ranging from more than 2 μm to not more than about 15 μm, and said reversible thermosensitive recording layer has a thickness ranging from 2 μm to less than 15 μm.
Claim 10
Dependent Claim
27 words
The information memory and display medium as claimed in claim 8, wherein said reversible thermosensitive recording layer has a thickness ranging from 2 μm to 10 μm.
References Cited (Backward Citations)
JPS59199284A
Cited
JPS6018388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |