Patent US4492967A successfully refreshed from Google Patents.
US4492967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording disc
Assignee: US Philips Corp
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Filing: 1983-01-10
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Granted: 1985-01-08
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Expires: 2003-01-10
Abstract
Abstract Optical recording disc having a supporting plate of synthetic resin or being coated with a layer of synthetic resin, an ablative recording layer on the synthetic resin or the layer of synthetic resin and a phosphorus derivative having at least one organic radical in the interface of the synthetic resin or layer of synthetic resin on the side of the recording layer.
Inventors
- 👤 Dirk J. Broer
- 👤 Adriaan W. De Poorter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:43
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/2572; G11B7/2575; G11B7/253; G11B7/2533; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
In an optical recording disc in which information can be written and read optically comprising a substrate having a synthetic resin surface and an ablative recording layer situated on said synthetic resin surface, the improvement wherein said synthetic resin surface comprises an organic phosphorous compound of the formula: ##STR2## wherein R is an alkyl group or an alkoxy group having 1 to 18 carbon atoms which may be ethoxylated, X has the value 1 or 2, N has the value 2-10, and M has the value 0-10.
Claim 2
Dependent Claim
87 words
In an optical recording disc in which information can be written and read optically comprising a substrate having a synthetic resin surface and an ablative recording layer situated on said synthetic resin surface, the improvement wherein said synthetic resin surface comprises an organic phosphorous compound of the formula: ##STR2## wherein R is an alkyl group or an alkoxy group having 1 to 18 carbon atoms which may be ethoxylated, X has the value 1 or 2, N has the value 2-10, and M has the value 0-10.
Claim 3
Dependent Claim
23 words
The recording disc of claim 1 wherein from about 0.5%-5% by weight of the phosphorous compound is present in said synthetic resin surface.
Claim 4
Dependent Claim
15 words
The recording disc of claim 2 wherein the substrate is formed of a synthetic resin.
Claim 5
Dependent Claim
11 words
The recording disc of claim 3 wherein the substrate is transparent.
Claim 6
Dependent Claim
26 words
The recording disc of claim 2 wherein the substrate is formed of glass and the synthetic resin surface is formed of a transparent synthetic resin layer.
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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |