Patent US4463089A successfully refreshed from Google Patents.
US4463089A
Expired / Lapsed
US
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Reflective optical data storage and laser recording medium
Assignee: LaserCard Corp
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Filing: 1982-12-20
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Granted: 1984-07-31
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Expires: 2002-12-20
Abstract
Abstract An improved reflective silver laser recording and data storage medium for direct read after writing, having a protective gold plating on the silver particles of the reflective surface. The gold plating increases the recording sensitivity resulting in higher contrast ratios for the recorded data. Increased contrast ratios between recorded and non-recorded reflective areas are obtained by the gold plating allowing lower laser energy for readout of recorded data. The reflective silver surface is plated with gold by an electroless ion displacement procedure.
Inventors
- 👤 Eric W. Bouldin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/251; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
65 words
A reflective metal optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, an electrically non-conductive dispersion of reflective first metal particles in the matrix layer, with said paticles having a density greater at the surface distal to the substrate, said first metal particles at the surface distal to the substrate having coatings of a second metal.
Claim 2
Dependent Claim
65 words
A reflective metal optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, an electrically non-conductive dispersion of reflective first metal particles in the matrix layer, with said paticles having a density greater at the surface distal to the substrate, said first metal particles at the surface distal to the substrate having coatings of a second metal.
Claim 3
Dependent Claim
25 words
The medium of claim 1 in which said reflective particles are silver particles, having a diameter greater than 20 angstroms and less than 350 angstroms.
Claim 4
Dependent Claim
15 words
The medium of claim 1 in which said second metal is more electro-negative than silver.
Claim 5
Dependent Claim
12 words
The medium of claim 3 in which said second metal is gold.
Claim 6
Dependent Claim
47 words
The medium of claim 1 in which said colloid matrix layer consists of an absorptive layer disposed on the substrate under the dispersion of metal particles, said absorptive layer having an optical density to red light between 0.2 and 3.0 and absorptive of visible and infrared light.
Claim 7
Dependent Claim
77 words
A reflective optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, an electrically non-conductive dispersion of reflective and non-reflective particles of a first metal in the matrix layer, said reflective particles of the first metal forming a reflective surface layer in said matrix layer, and a thin outer layer in said matrix, distal to the substrate, having reflective particles of the first metal plated with a second metal.
Claim 8
Dependent Claim
77 words
A reflective optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, an electrically non-conductive dispersion of reflective and non-reflective particles of a first metal in the matrix layer, said reflective particles of the first metal forming a reflective surface layer in said matrix layer, and a thin outer layer in said matrix, distal to the substrate, having reflective particles of the first metal plated with a second metal.
Claim 9
Dependent Claim
15 words
The data storage and recording medium of claim 6 wherein said first metal is silver.
Claim 10
Dependent Claim
18 words
The data storage and recording medium of claim 6 wherein said second metal is more electronegative than silver.
Claim 11
Dependent Claim
17 words
The data storage and recording medium of claim 6 wherein said coating is an ionic replacement coating.
Claim 12
Dependent Claim
80 words
A reflective optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, an electrically non-conductive dispersion of particles of a first metal in said matrix layer, said first metal particles forming a density gradient layer greater at the surface distal to the substrate, a portion of said first metal particles at the surface being reflective, said first metal particles on the surface distal to the substrate having coatings of a second metal.
Claim 13
Dependent Claim
80 words
A reflective optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, an electrically non-conductive dispersion of particles of a first metal in said matrix layer, said first metal particles forming a density gradient layer greater at the surface distal to the substrate, a portion of said first metal particles at the surface being reflective, said first metal particles on the surface distal to the substrate having coatings of a second metal.
Claim 14
Dependent Claim
15 words
The data storage and recording medium of claim 10 wherein said first metal is silver
Claim 15
Dependent Claim
18 words
The data storage and recording medium of claim 10 wherein said second metal is more electronegative than silver.
Claim 16
Dependent Claim
18 words
The data storage and recording medium of claim 10 wherein said second coating is an ionic replacement coating.
Claim 17
Dependent Claim
86 words
A reflective optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, said matrix layer having a first layer of essentially clear colloid proximate to the substrate, a second electrically non-conductive layer of reflective particles of a first metal dispersed in said matrix layer proximate to the first layer, a third electrically non-conductive layer of reflective particles of the first metal, said particles coated with a second metal, proximate to the second layer and distal to the substrate.
Claim 18
Dependent Claim
86 words
A reflective optical data storage and laser recording medium comprising a low melting colloid matrix layer supported on a substrate, said matrix layer having a first layer of essentially clear colloid proximate to the substrate, a second electrically non-conductive layer of reflective particles of a first metal dispersed in said matrix layer proximate to the first layer, a third electrically non-conductive layer of reflective particles of the first metal, said particles coated with a second metal, proximate to the second layer and distal to the substrate.
Claim 19
Dependent Claim
11 words
The medium of claim 1 wherein the first metal is silver.
Claim 20
Dependent Claim
14 words
The medium of claim 1 wherein the second metal is more electronegative than silver.
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |