US4448827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically readable information disc comprising an envelope of cross-linked synthetic resin
Assignee: US Philips Corp
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Filing: 1983-05-05
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Granted: 1984-05-15
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Expires: 2003-05-05
Abstract
Abstract An optically readable information disc having a carrier body of polycarbonate which on one side has an optically readable information track which is provided in the surface of the carrier body and which is covered with a reflection layer, the disc comprising an envelope of a cross-linked transparent synthetic resin extending as a closed envelope over the information track with reflection layer present on the upper side of the disc, over the edge of the disc and over the lower side of the disc.
Inventors
- 👤 Henricus G. J. A. M. Luijben
- 👤 Herman C. Meinders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:58
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G11B7/253; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24884; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
An optically readable information disc comprising a carrier body of polycarbonate which on one side has an optically readable information track which is provided in the surface of the carrier body and a reflection layer overlying the track, whereby the disc at playback is read by means of laser light which is focused on the information track via the carrier body of polycarbonate, characterized in that the disc comprises a mantle of a cross-linked transparent synthetic resin which extends as a closed envelope over the information track with the reflection layer present on the upper side of the disc, over the edge and over the lower side of the disc.
Claim 2
Dependent Claim
110 words
An optically readable information disc comprising a carrier body of polycarbonate which on one side has an optically readable information track which is provided in the surface of the carrier body and a reflection layer overlying the track, whereby the disc at playback is read by means of laser light which is focused on the information track via the carrier body of polycarbonate, characterized in that the disc comprises a mantle of a cross-linked transparent synthetic resin which extends as a closed envelope over the information track with the reflection layer present on the upper side of the disc, over the edge and over the lower side of the disc.
Claim 3
Dependent Claim
43 words
An optically readable information disc as claimed in claim 1, characterized in that the envelope is manufactured from a light-cured liquid composition which comprises a mixture of a polyester acrylate or an epoxy acrylate, an urethane acrylate, a cross-linkable diluent and a photo-initiator.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |