US5024927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1989-10-04
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Granted: 1991-06-18
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Expires: 2009-10-04
Abstract
Abstract An information recording medium comprising a substrate, and a recording layer formed thereon which comprises (a) a carbon-based material and (b) an optically reversible material whose optical characteristics can be reversibly changed, with the thermal decomposition temperature of the carbon-based material being higher than the melting point of the optically reversible material.
Inventors
- 👤 Katsuyuki Yamada
- 👤 Yukio Ide
- 👤 Makoto Harigaya
- 👤 Hiroko Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/245; G11B7/004; G11B7/0045; G11B7/00455; G11B7/26; G11B7/252; G11B7/257; G11B2007/25705; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B7/246; G11B7/248; G11B7/249; G11B7/251; G11B7/253; G11B7/2531; G11B7/2532; G11B7/2533; G11B7/2534; G11B7/256; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
An information recording medium capable of recording information reversibly with application of electromagnetic waves with different powers or wavelengths, comprising a substrate, and a recording layer formed thereon which comprises (a) a carbon-based material and (b) an optically reversible material whose optical characteristics can be reversibly changed, with the thermal decomposition temperature of said carbon-based material being higher than the melting point of said optically reversible material, wherein said carbon-based material is a polymer prepared by subjecting a pigment to plasma polymerization.
Claim 2
Dependent Claim
82 words
An information recording medium capable of recording information reversibly with application of electromagnetic waves with different powers or wavelengths, comprising a substrate, and a recording layer formed thereon which comprises (a) a carbon-based material and (b) an optically reversible material whose optical characteristics can be reversibly changed, with the thermal decomposition temperature of said carbon-based material being higher than the melting point of said optically reversible material, wherein said carbon-based material is a polymer prepared by subjecting a pigment to plasma polymerization.
Claim 3
Dependent Claim
16 words
The information recording medium as claimed in claim 1, wherein said pigment is a phthalocyanine-type pigment.
Claim 4
Dependent Claim
16 words
The information recording medium as claimed in claim 1, wherein said pigment is a quinacridone-type pigment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |