Patent US4241355A successfully refreshed from Google Patents.
US4241355A
Expired / Lapsed
US
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Ablative optical recording medium
Assignee: RCA Corp
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Filing: 1977-09-29
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Granted: 1980-12-23
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Expires: 1997-09-29
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 selected from the group consisting of lead phthalocyanine, chloroaluminum phthalocyanine, vanadyl phthalocyanine, stannic phthalocyanine and chloroaluminum chlorophthalocyanine. During recording, portions of the dye layer are ablated or vaporized by an intensity modulated focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.
Inventors
- 👤 Allen Bloom
- 👤 William J. Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:53
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/248; G01; G01D; G01D15/00; G01D15/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
An ablative optical recording medium comprising a light reflecting material coated with a layer of a light absorbing dye having the formula ##STR2## wherein X is hydrogen or chlorine and M is selected from the group consisting of lead, aluminum, vanadyl or tin (+4).
Claim 2
Dependent Claim
44 words
An ablative optical recording medium comprising a light reflecting material coated with a layer of a light absorbing dye having the formula ##STR2## wherein X is hydrogen or chlorine and M is selected from the group consisting of lead, aluminum, vanadyl or tin (+4).
Claim 3
Dependent Claim
31 words
A recording medium according to claim 1 wherein the dye layer thickness is chosen so as to minimize the reflectivity to a light source emitting light of about 750-850 nanometers wavelength.
Claim 4
Dependent Claim
27 words
A recording medium as in claim 1 wherein portions of said light reflecting material are exposed to form a light reflecting-light absorbing pattern corresponding to video information.
Claim 5
Dependent Claim
47 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 material a dye selected from the group consisting of lead phthalocyanine, chloroaluminum phthalocyanine, vanadyl phthalocyanine, stannic phthalocyanine and chloroaluminum chlorophthalocyanine.
Claim 6
Dependent Claim
47 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 material a dye selected from the group consisting of lead phthalocyanine, chloroaluminum phthalocyanine, vanadyl phthalocyanine, stannic phthalocyanine and chloroaluminum chlorophthalocyanine.
Claim 7
Dependent Claim
13 words
A recording medium as in claim 4 wherein the dye is lead phthalocyanine.
Claim 8
Dependent Claim
13 words
A recording medium as in claim 4 wherein the dye is chloroaluminum phthalocyanine.
Claim 9
Dependent Claim
13 words
A recording medium as in claim 4 wherein the dye is vanadyl phthalocyanine.
Claim 10
Dependent Claim
13 words
A recording medium as in claim 4 wherein the dye is chloroaluminum chlorophthalocyanine.
Claim 11
Dependent Claim
30 words
A recording medium according to claim 4 wherein the dye material thickness is chosen so as to minimize the reflectivity to a light source emitting at about 750-850 nanometers wavelength.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |