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Patent US4740449A successfully refreshed from Google Patents.
US4740449A
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Optical recording medium
Assignee: Canon Inc
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Filing: 1986-04-22
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Granted: 1988-04-26
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Expires: 2006-04-22
Abstract
Abstract An optical recording medium is provided which comprises an optical recording layer provided on a support, said optical recording layer containing a compound modifiable under light irradiation and gelled polymer.
Inventors
- 👤 Satoshi Yuasa
- 👤 Masahiro Haruta
- 👤 Yoko Yoshinaga
- 👤 Hirohide Munakata
- 👤 Kenji Saito
- 👤 Yukuo Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:05
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/245; G11B7/246; G11B7/2467; G11B7/249; G11B7/252; G11B7/253; G11B7/2531; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
An optical recording medium, comprising an optical recording layer provided on a support, said optical recording layer containing a compound modifiable under light irradiation and a gelled polymer, said gelled polymer being capable of undergoing phase transition caused by modification of said compound.
Claim 2
Dependent Claim
43 words
An optical recording medium, comprising an optical recording layer provided on a support, said optical recording layer containing a compound modifiable under light irradiation and a gelled polymer, said gelled polymer being capable of undergoing phase transition caused by modification of said compound.
Claim 3
Dependent Claim
20 words
An optical recording medium according to claim 1, wherein a transparent protective layer is provided on the optical recording layer.
Claim 4
Dependent Claim
21 words
An optical recording medium according to claim 1, wherein the gelled polymer becomes turbid in white when the compound is modified.
Claim 5
Dependent Claim
16 words
An optical recording medium according to claim 1, wherein the compound is dissociated under light irradiation.
Claim 6
Dependent Claim
34 words
An optical recording medium according to claim 1, wherein the compound produces a new functional group under light irradiation, said new functional group being capable of causing the gelled polymer to undergo phase transition.
Claim 7
Dependent Claim
27 words
An optical recording medium according to claim 1, wherein the compound is contained in an amount of 0.2-10% by weight based on the weight of the polymer.
Claim 8
Dependent Claim
23 words
An optical recording medium according to claim 1 wherein the optical recording layer has a thickness ranging from 1 μm to 1000 μm.
Claim 9
Dependent Claim
24 words
An optical recording medium according to claim 1, wherein said gelled polymer becomes turbid as a result of phase transition of said gelled polymer.
References Cited (Backward Citations)
US3215529A
Cited
US4216287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |