Patent US4639745A successfully refreshed from Google Patents.
US4639745A
Expired / Lapsed
US
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Optical recording medium
Assignee: Pioneer Corp
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Filing: 1985-01-10
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Granted: 1987-01-27
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Expires: 2005-01-10
Abstract
Abstract An optical information recording medium comprises a substrate, a first recording layer formed on the substrate, and a second recording layer formed on the first recording layer. The first recording layer comprises a first light-sensitive material that has been dissolved in a solvent that does not adversely affect the substrate. The second recording layer comprises a different light-sensitive material that has been dissolved in a solvent.
Inventors
- 👤 Fumio Matsui
- 👤 Shuichi Yanagisawa
- 👤 Yoshiyuki Kakuta
- 👤 Atsushi Yoshizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:18
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; G11B7/2531; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/2533; Y; Y10; Y10S; Y10S430/00; Y10S430/145; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
An optical information recording medium comprising: a substrate; a first recording layer of a first light-sensitive material on said substrate; and a second recording layer of a second light-sensitive material on said first recording layer, said second light-sensitive material being different from said first light-sensitive material, wherein said first light-sensitive material is nitrocellulose and said second light-sensitive material is Indocyanine Green.
Claim 2
Dependent Claim
61 words
An optical information recording medium comprising: a substrate; a first recording layer of a first light-sensitive material on said substrate; and a second recording layer of a second light-sensitive material on said first recording layer, said second light-sensitive material being different from said first light-sensitive material, wherein said first light-sensitive material is nitrocellulose and said second light-sensitive material is Indocyanine Green.
Claim 3
Dependent Claim
65 words
An optical information recording medium comprising: a substrate; a first recording layer of a first light-sensitive material on said substrate; and a second recording layer of a second light-sensitive material on said first recording layer, said second light-sensitive material being different from said first light-sensitive material, wherein said first light-sensitive material is a nickel complex of benzendithiol and said second light-sensitive material is Indocyanine Green.
Claim 4
Dependent Claim
65 words
An optical information recording medium comprising: a substrate; a first recording layer of a first light-sensitive material on said substrate; and a second recording layer of a second light-sensitive material on said first recording layer, said second light-sensitive material being different from said first light-sensitive material, wherein said first light-sensitive material is a nickel complex of benzendithiol and said second light-sensitive material is Indocyanine Green.
Claim 5
Dependent Claim
44 words
An optical information recording medium, comprising: a substrate of an acrylic acid resin; a first recording layer formed on said substrate and made of a water-soluble cyanine dye; and a second recording layer formed on said substrate and made of a water-insoluble cyanine dye.
Claim 6
Dependent Claim
44 words
An optical information recording medium, comprising: a substrate of an acrylic acid resin; a first recording layer formed on said substrate and made of a water-soluble cyanine dye; and a second recording layer formed on said substrate and made of a water-insoluble cyanine dye.
Claim 7
Dependent Claim
17 words
An optical information recording medium according to claim 3, wherein said water-soluble cyanine dye comprises Indocyanine Green.
References Cited (Backward Citations)
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |