US4023185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ablative optical recording medium
Assignee: RCA Corp
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Filing: 1976-03-19
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Granted: 1977-05-10
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Expires: 1996-03-19
Abstract
Abstract An ablative recording medium comprises a substrate coated with a light reflecting coating which in turn is coated with a light absorptive layer of 4-phenylazo-1-naphthylamine formed by evaporation of Sudan Black B dyestuff. During recording, portions of the organic coating are ablated, or vaporized, by a modulated focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.
Inventors
- 👤 Allen Bloom
- 👤 Robert Alfred Bartolini
- 👤 Alan Edward Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/10; G01D15/14; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/2467; G11B7/252; G11B7/258; G11B7/2585; G11B7/253; G11B7/2531; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
33 words
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing layer, the improvement which comprises employing as the light absorbing layer an amorphous layer of 4-phenylazo-1-naphthylamine.
Claim 2
Dependent Claim
33 words
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing layer, the improvement which comprises employing as the light absorbing layer an amorphous layer of 4-phenylazo-1-naphthylamine.
Claim 3
Dependent Claim
12 words
A medium according to claim 1 wherein said reflecting material is aluminum.
Claim 4
Dependent Claim
22 words
A medium according to claim 1 wherein said light reflecting material is in the form of a thin layer on a substrate.
Claim 5
Dependent Claim
17 words
A medium according to claim 3 wherein said light reflecting layer is aluminum on a glass substrate.
Claim 6
Dependent Claim
30 words
A medium according to claim 3 wherein said light reflecting layer is aluminum about 250 to 500 angstroms thick which has been oxidized to a depth of about 25-30 angstroms.
Claim 7
Dependent Claim
15 words
A medium according to claim 1 wherein said 4-phenylazo-1-naphthylamine layer is about 525 angstroms thick.
Claim 8
Dependent Claim
15 words
A medium according to claim 5 wherein said 4-phenylazo-1-naphthylamine layer is about 525 angstroms thick.
Claim 9
Dependent Claim
26 words
A medium according to claim 1 wherein portions of said light reflecting material are exposed to form a light reflecting-light absorbing pattern corresponding to video information.
Claim 10
Dependent Claim
26 words
A medium according to claim 3 wherein portions of said light reflecting material are exposed to form a light reflecting-light absorbing pattern corresponding to video information.
Claim 11
Dependent Claim
26 words
A medium according to claim 5 wherein portions of said light reflecting material are exposed to form a light reflecting-light absorbing pattern corresponding to video information.
Claim 12
Dependent Claim
26 words
A medium according to claim 7 wherein portions of said light reflecting material are exposed to form a light reflecting-light absorbing pattern corresponding to video information.
Claim 13
Independent Claim
61 words
A method of making an optical recording medium which comprises evaporating a layer of aluminum about 250 to about 500 angstroms thick onto a substrate under vacuum, oxidizing said aluminum layer to a depth of from about 25 to about 30 angstroms, and evaporating Sudan Black B dyestuff under vacuum to form a layer of 4-phenylazo-1-naphthylamine on said oxidized aluminum layer.
Claim 14
Independent Claim
61 words
A method of making an optical recording medium which comprises evaporating a layer of aluminum about 250 to about 500 angstroms thick onto a substrate under vacuum, oxidizing said aluminum layer to a depth of from about 25 to about 30 angstroms, and evaporating Sudan Black B dyestuff under vacuum to form a layer of 4-phenylazo-1-naphthylamine on said oxidized aluminum layer.
Claim 15
Dependent Claim
15 words
A method according to claim 12 wherein said 4-phenylazo-1-naphthylamine layer is about 525 angstroms thick.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |