US5196294A
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Erasable optical recording materials and methods based on tellurium alloys
Assignee: GROUP 47 Inc
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Filing: 1990-09-17
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Granted: 1993-03-23
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Expires: 2010-09-17
Abstract
Abstract An optical recording element comprising a thin film of an alloy is disclosed. The alloy is represented by the formula Te.sub.a (Sb.sub.x Sn.sub.y In.sub.z).sub.1-a wherein a is between about 0.38 and 0.62; x is between about 0.05 and 0.65; y divided by z is between about 0.5 and 5; with the proviso that the product of (y+z) and (1-a) is greater than about 0.20. The alloys have improved data stability while retaining excellent write-erase characteristics.
Inventors
- 👤 Kee C. Pan
- 👤 Yuan S. Tyan
- 👤 Fridrich Vazan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:31
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/004; G11B7/0055; G11B7/00557; G11B2007/24302; G11B2007/2431; G11B2007/24312; G11B2007/24314; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
An optical recording element comprising a thin film optical recording layer of an alloy, said alloy represented by the formula Te.sub.a (Sb.sub.x Sn.sub.y In.sub.z).sub.1-a wherein a is between about 0.38 and 0.62; x is between about 0.05 and 0.65; y divided by z is between about 0.5 and 5; with the proviso that the product of (y+z) and (1-a) is greater than 0.20.
Claim 2
Dependent Claim
63 words
An optical recording element comprising a thin film optical recording layer of an alloy, said alloy represented by the formula Te.sub.a (Sb.sub.x Sn.sub.y In.sub.z).sub.1-a wherein a is between about 0.38 and 0.62; x is between about 0.05 and 0.65; y divided by z is between about 0.5 and 5; with the proviso that the product of (y+z) and (1-a) is greater than 0.20.
Claim 3
Dependent Claim
37 words
The optical recording element according to claim 1 wherein a is between about 0.40 and 0.60; x is between about 0.10 and 0.60; y/z is between about 1 and 4 and (y+z)(1-a) is greater than about 0.25.
Claim 4
Dependent Claim
13 words
The optical recording element according to claim 1 wherein a is about 0.5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |