US4983505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1989-07-18
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Granted: 1991-01-08
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Expires: 2009-07-18
Abstract
Abstract An optical recording medium comprising at least one recording layer on a substrate and a protective layer overlying the recording layer, the protective layer comprising a UV cured resin composition containing a urethane acrylate, N-vinylpyrolidone, a trifunctional or higher functional acrylate, and a photoinitiator.
Inventors
- 👤 Manabu Higuchi
- 👤 Masao Yabe
- 👤 Hideki Matsubara
- 👤 Tetsuji Jitsumatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24306; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/257; G11B2007/25705; G11B2007/2571; G11B2007/25713; G11B7/253; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31605; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
An optical recording medium comprising at least one recording layer on a substrate, further comprising a protective layer comprising a UV cured resin of a composition containing a urethane acrylate, N-vinyl-pyrrolidone, a trifunctional or greater functional acrylate, and a photoinitiator, wherein the urethane acrylate has at least two acryloyl groups in the molecule and a molecular weight of 400 to 1,500 per acryloyl group.
Claim 2
Dependent Claim
64 words
An optical recording medium comprising at least one recording layer on a substrate, further comprising a protective layer comprising a UV cured resin of a composition containing a urethane acrylate, N-vinyl-pyrrolidone, a trifunctional or greater functional acrylate, and a photoinitiator, wherein the urethane acrylate has at least two acryloyl groups in the molecule and a molecular weight of 400 to 1,500 per acryloyl group.
Claim 3
Dependent Claim
27 words
An optical recording medium as claimed in claim 1, wherein the urethane acrylate content of said UV cured resin composition is from 35 to 70 wt %.
Claim 4
Dependent Claim
32 words
An optical recording medium as claimed in claim 1, wherein the content of acrylate having trifunctionality or higher functionality in said UV cured resin composition is from 2 to 15 wt %.
Claim 5
Dependent Claim
27 words
An optical recording medium as claimed in claim 1, wherein the content of N-vinylpyrolidone in said UV cured resin composition is from 5 to 40 wt %.
Claim 6
Dependent Claim
22 words
An optical recording medium as claimed in claim 1, wherein the thickness of said protective layer is from 2 to 30 μm.
Claim 7
Dependent Claim
27 words
An optical recording medium as claimed in claim 1 further comprising two inorganic protective layers provided on the both sides of said recording layer in contact therewith.
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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |