US4946724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitreous film and heat-mode optical recording medium using same
Assignee: Canon Inc
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Filing: 1988-12-27
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Granted: 1990-08-07
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Expires: 2008-12-27
Abstract
Abstract A vitreous film containing, e.g., 30-90 wt. % of Sn, 1-20 wt. % of P, 0.1-20 wt. % of Pb, 2-30 wt. % of 0 and 5-35 wt. % of F is formed by vapor deposition on a substrate such as glass, metal, plastic or ceramic. A light-absorbing substance can be incorporated in the vitreous film to provide a recording layer for a heat-mode optical recording medium capable of causing decoloration or formation of pits on irradiation with a laser beam.
Inventors
- 👤 Seiichi Shingaki
- 👤 Kazuyoshi Nagao
- 👤 Yasuo Takahashi
- 👤 Takashi Noma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:48
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; C03C17/00; C03C17/02; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24318; G11B2007/2432; G11B2007/24326; G11B7/252; G11B7/253; G11B7/2531; G11B7/2532; G11B7/2533; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
37 words
A vitreous film formed on a substrate, containing 30-90 wt. % of Sn, 1-20 wt. % of P, 0.1-20 wt. % of Pb, 2-30 wt. % of 0 and 5 -35 % of F as principal elements.
Claim 2
Dependent Claim
37 words
A vitreous film formed on a substrate, containing 30-90 wt. % of Sn, 1-20 wt. % of P, 0.1-20 wt. % of Pb, 2-30 wt. % of 0 and 5 -35 % of F as principal elements.
Claim 3
Dependent Claim
14 words
A vitreous film according to claim 1, which contains 5-25 wt. % of F.
Claim 4
Dependent Claim
15 words
A vitreous film according to claim 1, which has a refractive index of above 1.65.
Claim 5
Dependent Claim
14 words
A vitreous film according to claim 1, which has been formed by vapor deposition.
Claim 6
Dependent Claim
65 words
A heat-mode optical recording medium, comprising a recording layer in the form of a vitreous film comprising 30-90 wt. % of Sn, 1-20 wt. % of P, 0.1-20 wt. % of Pb, 2-30 wt. % of 0 and 5-35 wt. % of F as principal glass forming elements and 1-80 wt. parts of a light-absorbing substance per 100 wt. parts of the total glass-forming elements.
Claim 7
Dependent Claim
65 words
A heat-mode optical recording medium, comprising a recording layer in the form of a vitreous film comprising 30-90 wt. % of Sn, 1-20 wt. % of P, 0.1-20 wt. % of Pb, 2-30 wt. % of 0 and 5-35 wt. % of F as principal glass forming elements and 1-80 wt. parts of a light-absorbing substance per 100 wt. parts of the total glass-forming elements.
Claim 8
Dependent Claim
18 words
An optical recording medium according to claim 5, wherein said recording layer has been formed by vapor deposition.
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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |