US4242689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ablative optical recording medium
Assignee: RCA Corp
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Filing: 1977-09-19
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Granted: 1980-12-30
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Expires: 1997-09-19
Abstract
Abstract An ablative recording medium comprises a substrate coated with a light reflecting layer which in turn is coated with a light absorptive layer of di-indeno[1,2,3-cd:1',2',3'-lm]perylene. During recording, portions of the light absorptive layer are ablated by a modulated focussed light beam, thereby exposing portions of the reflecting layer. Video information is recorded as a reflective-antireflective pattern.
Inventors
- 👤 Allen Bloom
- 👤 Alfred Bartolini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/34; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/252; G11B7/258; G11B7/2585; G11B7/246; G11B7/254
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing material, the improvement which comprises employing as the light absorbing layer a layer of di-indeno[1,2,3-cd:1',2',3'-1m]perylene.
Claim 2
Dependent Claim
32 words
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing material, the improvement which comprises employing as the light absorbing layer a layer of di-indeno[1,2,3-cd:1',2',3'-1m]perylene.
Claim 3
Dependent Claim
12 words
A medium according to claim 1 wherein said reflecting material is aluminum.
Claim 4
Dependent Claim
12 words
A medium according to claim 1 wherein said reflecting material is gold.
Claim 5
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 6
Dependent Claim
15 words
A medium according to claim 2 wherein said di-indeno[1,2,3-cd:1',2',3'-1m]perylene layer is about 270 angstroms thick.
Claim 7
Dependent Claim
15 words
A medium according to claim 3 wherein said di-indeno[1,2,3-cd:1',2',3'-1m]perylene layer is about 175 angstrom thick.
Claim 8
Dependent Claim
20 words
A medium according to claim 1 wherein a silicone resin protective overcoat layer is applied over the light absorbing layer.
References Cited (Backward Citations)
US4069487A
Cited
US4023185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |