Patent US5020048A successfully refreshed from Google Patents.
US5020048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium having a protective film which can be stripped
Assignee: Sony Corp
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Filing: 1989-12-12
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Granted: 1991-05-28
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Expires: 2009-12-12
Abstract
Abstract An optical information recording medium having at least a transparent substrate and a recording layer and capable of recording an information by irradiating the recording layer with laser beams from the transparent substrate side, wherein a protective film having hygroscopic property is formed on a light incident surface of the transparent substrate so that it can be stripped therefrom.
Inventors
- 👤 Yuji Arai
- 👤 Hiroshi Ogawa
- 👤 Masahiro Hotori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:31
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/24097; G11B7/2542; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/253; G11B7/2533; G11B7/2534; G11B7/258; G11B7/2595
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
An optical information recording medium having at least a transparent substrate and a recording layer which is capable of recording information when irradiated with laser beams from the transparent substrate side, comprising: a protective, hygroscopic, antistatic electricity film formed on a light incident surface of the transparent substrate in such a manner that the protective film can be stripped therefrom.
Claim 2
Dependent Claim
60 words
An optical information recording medium having at least a transparent substrate and a recording layer which is capable of recording information when irradiated with laser beams from the transparent substrate side, comprising: a protective, hygroscopic, antistatic electricity film formed on a light incident surface of the transparent substrate in such a manner that the protective film can be stripped therefrom.
Claim 3
Dependent Claim
21 words
An optical information recording medium according to claim 1, wherein the protective film is made of resin having a hydroxyl group.
Claim 4
Dependent Claim
18 words
An optical information recording medium according to claim 2, wherein the protective film is made of polyvinyl alcohol.
Claim 5
Dependent Claim
36 words
An optical information recording medium according to claim 1 or 2, wherein the protective film is colored by a colorant selected from the group consisting essentially of Rhodamine B, Rhodamine 19, Brilliant Green, and Methyline Blue.
Claim 6
Dependent Claim
22 words
An optical information recording medium according to claim 4, wherein the recording layer is made of an organic dye-based optical recording material.
Claim 7
Dependent Claim
18 words
An optical information recording medium according to claim 1, wherein the protective film includes an electrically conductive material.
Claim 8
Dependent Claim
18 words
An optical information recording medium according to claim 1, wherein the protective film includes a surface active agent.
Claim 9
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein the protective film includes an amphoteric surface active agent.
Claim 10
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein the protective film includes a nonionic surface active agent.
Claim 11
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein the protective film includes an anion surface active agent.
Claim 12
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein the protective film includes a cation surface active agent.
Claim 13
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein the protective film includes a cyclohexane-based surface active agent.
Claim 14
Dependent Claim
52 words
An optical information recording medium according to claims 1 or 2, wherein the protective film includes one or more of the following surface active agent compounds: alkyl betaine, alkyl aminoxide, alkyl trimethly ammonium salt, polyoxyethylene alkyl amine, alkyl phosphate, alkyl amine acetate, acrylic acid having a functional group, and methacrylic acid polymer.
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JPS5749734U
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JPS5849337U
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US4879710A
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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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |