Patent US4396701A successfully refreshed from Google Patents.
US4396701A
Expired / Lapsed
US
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Highly absorptive dye-containing underlayer for laser recording and data storage media
Assignee: LaserCard Corp
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Filing: 1981-09-11
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Granted: 1983-08-02
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Expires: 2001-09-11
Abstract
Abstract An underlayer for a laser recording and data storage medium with a light absorption characteristic suited to a recording laser. The underlayer is formed by creating a nuclei layer in a silver-halide photosensitive emulsion layer and then contacting the emulsion layer with a chromogenic reducing agent and a chromogenic dye coupler. The reflective layer may be formed prior to this step by subjecting the nuclei layer to a monobath having a silver-halide solvent and a silver reducing agent until a reflective surface layer of non-filamentary silver particles is formed, or after the step by chemical vapor deposition or sputtering of a reflective metal layer over the underlayer.
Inventors
- 👤 Eric W. Bouldin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:13
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/251; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
A reflective laser recording and optical data storage medium comprising, a substrate supporting a colloid matrix layer, said colloid matrix layer having a reflective metal surface layer distal to the substrate and a light absorptive underlayer beneath the reflective metal surface layer, formed by black filamentary silver particles and light-absorbing in situ-formed organic dye molecules with an optical density gradient highest proximate to the reflective surface layer.
Claim 2
Dependent Claim
67 words
A reflective laser recording and optical data storage medium comprising, a substrate supporting a colloid matrix layer, said colloid matrix layer having a reflective metal surface layer distal to the substrate and a light absorptive underlayer beneath the reflective metal surface layer, formed by black filamentary silver particles and light-absorbing in situ-formed organic dye molecules with an optical density gradient highest proximate to the reflective surface layer.
Claim 3
Dependent Claim
18 words
The medium of claim 1 where said reflective surface layer comprises non-filamentary silver particles and is electrically non-conductive.
Claim 4
Dependent Claim
21 words
The medium of claim 1 where said reflective surface layer comprises a reflective metal layer deposited over the colloid matrix layer.
Claim 5
Dependent Claim
42 words
A reflective laser recording and optical data storage medium comprising a substrate supporting a light-absorptive colloid matrix layer covered by a vapor-deposited reflective metal layer, said colloid matrix layer composed of black filamentary silver particles and in situ-formed light-absorptive organic dye molecules.
Claim 6
Dependent Claim
42 words
A reflective laser recording and optical data storage medium comprising a substrate supporting a light-absorptive colloid matrix layer covered by a vapor-deposited reflective metal layer, said colloid matrix layer composed of black filamentary silver particles and in situ-formed light-absorptive organic dye molecules.
Claim 7
Dependent Claim
20 words
The medium of claim 4 in which the in situ-formed organic dye molecules are absorptive to red and infrared wavelengths.
Claim 8
Dependent Claim
18 words
The medium of claim 4 in which the in situ-formed organic dye molecules are absorptive to blue wavelength.
Claim 9
Dependent Claim
53 words
A reflective laser recording and optical data storage medium consisting of a thin reflective metal surface layer on an underlayer of colloid on a substrate in which the underlayer comprises light-absorptive black filamentary silver particles and in situ-formed organic dye molecules with an optical density gradient highest proximate to the reflective surface layer.
Claim 10
Dependent Claim
53 words
A reflective laser recording and optical data storage medium consisting of a thin reflective metal surface layer on an underlayer of colloid on a substrate in which the underlayer comprises light-absorptive black filamentary silver particles and in situ-formed organic dye molecules with an optical density gradient highest proximate to the reflective surface layer.
Claim 11
Dependent Claim
15 words
The medium of claim 1 in which said reflective metal surface layer is electrically non-conductive.
Claim 12
Dependent Claim
15 words
The medium of claim 7 in which said reflective metal surface layer is electrically non-conductive.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |