Patent US4543307A successfully refreshed from Google Patents.
US4543307A
Expired / Lapsed
US
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Optical data storage and recording media having recording surface protection
Assignee: LaserCard Corp
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Filing: 1984-02-17
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Granted: 1985-09-24
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Expires: 2004-02-17
Abstract
Abstract A method for protecting the recording surfaces of optical data storage and recording tape provides the tape edges with protuberances formed by plastic coatings, embossments or thickness gradients of the recording material.
Inventors
- 👤 Jerome Drexler
- 👤 Richard Haddock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G11B23/00; G11B23/0014; G11B7/24003; G11B7/24009; G11B7/24097; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24198; Y10T428/24479; Y10T428/24562; Y10T428/24612
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
An optical recording medium comprising, a substrate having at least one major surface having a layer of optical recording material thereon, said substrate and said layer of optical recording material having lateral edge regions, said edge regions adhered to and encased in a thermosetting plastic coating, said coating having a thickness of less than 5 microns.
Claim 2
Dependent Claim
56 words
An optical recording medium comprising, a substrate having at least one major surface having a layer of optical recording material thereon, said substrate and said layer of optical recording material having lateral edge regions, said edge regions adhered to and encased in a thermosetting plastic coating, said coating having a thickness of less than 5 microns.
Claim 3
Dependent Claim
31 words
The medium of claim 1 wherein the plastic coating is less than 0.5 mm wide measured from the outward extremity of the edge regions toward the central portions of the surfaces.
Claim 4
Dependent Claim
95 words
An optical recording medium comprising, a tape having at least one major surface having a layer of optical recording material thereon and said tape and said layer having opposite lateral edge regions, said edge regions adhered to and encased in a thin thermosetting plastic coating, said plastic coating having a thickness of less than 5 microns and being less than 0.5 mm. wide from the outward extremity of the edge toward the central portions of the tape, thereby forming protuberances on said edge regions protecting the optical recording material from contact with other tape sections.
Claim 5
Dependent Claim
95 words
An optical recording medium comprising, a tape having at least one major surface having a layer of optical recording material thereon and said tape and said layer having opposite lateral edge regions, said edge regions adhered to and encased in a thin thermosetting plastic coating, said plastic coating having a thickness of less than 5 microns and being less than 0.5 mm. wide from the outward extremity of the edge toward the central portions of the tape, thereby forming protuberances on said edge regions protecting the optical recording material from contact with other tape sections.
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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |