Patent US4389719A successfully refreshed from Google Patents.
US4389719A
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Optically readable information disk
Assignee: US Philips Corp
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Filing: 1980-09-08
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Granted: 1983-06-21
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Expires: 2000-09-08
Abstract
Abstract An optically readable information disk which comprises a transparent substrate plate (1) of PVC or a copolymer of vinyl chloride which is provided on one side with a reflecting optical structure (2-5) and on the other side with a radiation-cured lacquer layer (6) which is transparent to the laser light (7) used.
Inventors
- 👤 Michael J. C. Van de Donk
- 👤 Hendricus C. A. M. Heinemans
- 👤 Petrus E. J. Legierse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:18
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G03; G03F; G03F7/00; G03F7/0005; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G11B7/253; G11B7/2533; G11B7/2534; G11B7/258; G11B7/2585; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
An optically readable information disk consisting essentially of a transparent substrate plate of polyvinyl chloride or a copolymer of vinyl chloride provided on one side with a reflecting optical structure comprising a radiation cured lacquer layer containing an information track having a crenelated profile of information areas situated alternatively at a higher and a lower level and a reflecting layer located on said radiation cured lacquer layer, said information track being readable by reflective laser light through said substrate plate, and, on the surface of the substrate plate remote from the optical structure a radiation cured lacquer layer transparent to the laser light employed.
Claim 2
Dependent Claim
104 words
An optically readable information disk consisting essentially of a transparent substrate plate of polyvinyl chloride or a copolymer of vinyl chloride provided on one side with a reflecting optical structure comprising a radiation cured lacquer layer containing an information track having a crenelated profile of information areas situated alternatively at a higher and a lower level and a reflecting layer located on said radiation cured lacquer layer, said information track being readable by reflective laser light through said substrate plate, and, on the surface of the substrate plate remote from the optical structure a radiation cured lacquer layer transparent to the laser light employed.
Claim 3
Dependent Claim
53 words
An optically readable information disk as claimed in claim 1, characterized in that the substrate plate is built up from an even number of stacked foils of calendered hard PVC which are compressed to form one assembly, the directions of stretching of the successive calendered foils being at right angles to each other.
Claim 4
Dependent Claim
23 words
An optically readable information disk as claimed in claim 1 or 2, characterized in that the lacquer layer comprises radiation-curable acrylic acid esters.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |