US4629649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording medium and method
Assignee: TDK Corp
•
Filing: 1985-06-07
•
Granted: 1986-12-16
•
Expires: 2005-06-07
Abstract
Abstract In an information recording medium comprising a substrate and a recording layer, the recording layer is formed from a germanium-tin material. Recording light may be conducted to the layer where amorphous-crystalline phase transition or crystal form change occurs.
Inventors
- 👤 Yukio Osaka
- 👤 Takeshi Imura
- 👤 Toshio Nakashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:34
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
An information recording medium comprising a substrate and a recording layer formed thereon consisting essentially of germanium and tin in an atomic ratio of Sn/(Ge+Sn) of 0.05 to 0.95.
Claim 2
Dependent Claim
29 words
An information recording medium comprising a substrate and a recording layer formed thereon consisting essentially of germanium and tin in an atomic ratio of Sn/(Ge+Sn) of 0.05 to 0.95.
Claim 3
Dependent Claim
18 words
An information recording medium according to claim 1 wherein the atomic ratio Sn/(Ge+Sn) ranges from 0.15 to 0.5.
Claim 4
Independent Claim
56 words
A method for recording information in an infomation recording medium comprising a substrate and a recording layer formed theron consisting essentially of germanium and tin in an atomic ratio of Sn/(Ge+Sn) of 0.05 to 0.95, wherein recording is carried out by causing amorphous-crystalline phase transition or crystal form change to take place in the recording layer.
Claim 5
Independent Claim
56 words
A method for recording information in an infomation recording medium comprising a substrate and a recording layer formed theron consisting essentially of germanium and tin in an atomic ratio of Sn/(Ge+Sn) of 0.05 to 0.95, wherein recording is carried out by causing amorphous-crystalline phase transition or crystal form change to take place in the recording layer.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |