Patent US4218689A successfully refreshed from Google Patents.
US4218689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ablatable medium for optical recording
Assignee: RCA Corp
•
Filing: 1978-01-30
•
Granted: 1980-08-19
•
Expires: 1998-01-30
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 6,6'-diethoxythioindigo. 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
- 👤 Robert A. Bartolini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:53
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/2585; G11B7/242; G11B7/244; G11B7/246; G11B7/253; G11B7/2531; G11B7/2533; G11B7/254; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing ablative layer which upon exposure to light ablates to expose the light reflecting material, the improvement which comprises employing as the light absorbing ablative layer a smooth, clear continuous, amorphous layer consisting of 6,6'-diethoxythioindigo.
Claim 2
Dependent Claim
51 words
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing ablative layer which upon exposure to light ablates to expose the light reflecting material, the improvement which comprises employing as the light absorbing ablative layer a smooth, clear continuous, amorphous layer consisting of 6,6'-diethoxythioindigo.
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
15 words
A medium according to claim 2 wherein said 6,6'-diethoxythioindigo layer is about 710 angstroms thick.
Claim 6
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)
US2403226A
Cited
US2475821A
Cited
GB1076799A
Cited
US3715212A
Cited
US3978247A
Cited
US4032691A
Cited
US4069487A
Cited
US4023185A
Cited
US4097895A
Cited
US4101907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |