US4766021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: BASF SE
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Filing: 1987-03-06
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Granted: 1988-08-23
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Expires: 2007-03-06
Abstract
Abstract Optical recording media for recording and retrieval of information by means of high energy radiation, which media consist essentially of a polymeric base having uniaxial orientation and, applied on this, a metal film of high reflectivity having the orientation of the crystallites corresponding to the orientation of the base and retrieval of information are effected by means of high energy radiation.
Inventors
- 👤 Arend Werner
- 👤 Hartmut Hibst
- 👤 Juergen Petermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132; Y10T428/24355; Y10T428/24372; Y10T428/24413
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
69 words
An optical recording medium for recording and retrieving information by means of high energy radiation, essentially consisting of a polymeric base and, applied on this, a polycrystalline metal film of high reflectivity, wherein the polymer base consists essentially of a polymer substrate and a uniaxially oriented polymeric surface layer and the polycrystalline metal film has the uniform crystallographic orientation of the crystallites corresponding to the orientation of the base.
Claim 2
Dependent Claim
69 words
An optical recording medium for recording and retrieving information by means of high energy radiation, essentially consisting of a polymeric base and, applied on this, a polycrystalline metal film of high reflectivity, wherein the polymer base consists essentially of a polymer substrate and a uniaxially oriented polymeric surface layer and the polycrystalline metal film has the uniform crystallographic orientation of the crystallites corresponding to the orientation of the base.
Claim 3
Dependent Claim
24 words
An optical recording medium as claimed in claim 1, wherein the metal of the layer deposited by vapor deposition is tin, tellurium or bismuth.
References Cited (Backward Citations)
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US3901851A
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US3816237A
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US4304807A
Cited
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Cited
US4425570A
Cited
US4610903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |