US4385376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an optical memory disk and a product thereby
Assignee: Toshiba Corp
•
Filing: 1981-09-04
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Granted: 1983-05-24
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Expires: 2001-09-04
Abstract
Abstract A method of making an optical memory disk and a product thereby comprising the steps of applying a thin tellurium film to a base plate, and of forming an oxidizing layer on the surface of the tellurium by oxidizing treatment of the tellurium film, and an optical memory disk produced by the above-mentioned method.
Inventors
- 👤 Takashi Takaoka
- 👤 Masahiko Mochizuki
- 👤 Tadao Miura
- 👤 Mitsuo Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:17
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/2578; C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; G11B7/242; G11B7/243; G11B7/254; G11B7/2548; G11B2007/24302; G11B2007/24316; G11B2007/25705; G11B2007/25715; G11B7/253; G11B7/2531; G11B7/2533; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10S430/162
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
An optical memory disk having a thin film of tellurium formed on a base plate and at least two layers of an oxide of tellurium formed on the surface thereof, said layers being formed by an oxidizing treatment of said surface and being of different oxides.
Claim 2
Dependent Claim
46 words
An optical memory disk having a thin film of tellurium formed on a base plate and at least two layers of an oxide of tellurium formed on the surface thereof, said layers being formed by an oxidizing treatment of said surface and being of different oxides.
Claim 3
Dependent Claim
15 words
A disk as in claim 1, wherein said oxide layers are formed by ultra-violet rays.
Claim 4
Dependent Claim
19 words
A disk as in claim 1 or 2 wherein said base plate is coated by a metal oxide film.
Claim 5
Dependent Claim
28 words
A disk as in claim 1 or 2, wherein said two layers are at least 20 A thick and said tellurium layer is at least 200 A thick.
References Cited (Backward Citations)
US3445281A
Cited
US3944440A
Cited
GB1439869A
Cited
US4214249A
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US3971874A
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US3938242A
Cited
US3900601A
Cited
US4000346A
Cited
US4222071A
Cited
US4282295A
Cited
US4318112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |