US4576896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Sumitomo Bakelite Co Ltd
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Filing: 1984-10-23
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Granted: 1986-03-18
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Expires: 2004-10-23
Abstract
Abstract An optical recording medium comprising a transparent substrate of a synthetic resin and an information recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, wherein said transparent substrate consists essentially of a cast-cured product of an epoxy resin composition comprising an alicyclic epoxy resin, or a mixture of a major amount of an alicyclic epoxy resin and a minor amount of an aromatic epoxy resin, an organic polybasic acid anhydride, a curing-accelerator and an anti-discoloring agent.
Inventors
- 👤 Setsuo Suzuki
- 👤 Morio Tsuge
- 👤 Syoichi Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:15
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0057; G11B23/0064; G11B23/0092; C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/226; C08G59/24; C09; C09D; C09D4/00; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
An optical recording medium comprising a transparent substrate of a synthetic resin and an information recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, said transparent substrate consisting essentially of a cast-cured product of an epoxy resin composition comprising an alicyclic epoxy resin, an organic polybasic acid anhydride, a curing-accelerator and an anti-discoloring agent.
Claim 2
Dependent Claim
66 words
An optical recording medium comprising a transparent substrate of a synthetic resin and an information recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, said transparent substrate consisting essentially of a cast-cured product of an epoxy resin composition comprising an alicyclic epoxy resin, an organic polybasic acid anhydride, a curing-accelerator and an anti-discoloring agent.
Claim 3
Dependent Claim
40 words
An optical recording medium according to claim 1, wherein the transparent substrate has a SiO or SiO 2 film bonded to one side or both sides and the information. recording layer is bonded to the SiO or SiO 2 film.
Claim 4
Dependent Claim
44 words
An optical recording medium according to claim 1, wherein the transparent substrate has a coating film of a radiation-curable resin, a thermosetting resin or a mixture thereof bonded to one side or both sides and the information-recording layer is bonded to the coating film.
Claim 5
Dependent Claim
58 words
An optical recording medium according to claim 1, wherein the transparent substrate has a coating film of a radiation-curable resin or a thermosetting resin bonded to one side or both sides and a SiO or SiO 2 film is further bonded to said coating film, and the information-recording layer is attached to the SiO or SiO 2 film.
Claim 6
Dependent Claim
82 words
An optical recording medium comprising a transparent substrate of a synthetic resin and an information-recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, said transparent substrate consisting essentially of a cast-cured product of an epoxy resin composition comprising a mixture of a major amount of an alicyclic epoxy resin and a minor amount of an aromatic epoxy resin, an organic polybasic acid anhydride, a curing accelerator and an anti-discoloring agent.
Claim 7
Dependent Claim
82 words
An optical recording medium comprising a transparent substrate of a synthetic resin and an information-recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, said transparent substrate consisting essentially of a cast-cured product of an epoxy resin composition comprising a mixture of a major amount of an alicyclic epoxy resin and a minor amount of an aromatic epoxy resin, an organic polybasic acid anhydride, a curing accelerator and an anti-discoloring agent.
Claim 8
Dependent Claim
39 words
An optical recording medium according to claim 5, wherein the transparent substrate has a SiO or SiO 2 film bonded to one side or both sides and the information-recording layer is bonded to the SiO or SiO 2 film.
Claim 9
Dependent Claim
44 words
An optical recording medium according to claim 5, wherein the transparent substrate has a coating film of a radiation-curable resin, a thermosetting resin or a mixture thereof bonded to one side or both sides and the information-recording layer is bonded to the coating film.
Claim 10
Dependent Claim
24 words
An optical recording medium according to claim 5, 6 or 7 wherein the cast-cured product has an index of refraction of 1.50 to 1.60.
Claim 11
Dependent Claim
58 words
An optical recording medium according to claim 5, wherein the transparent substrate has a coating film of a radiation-curable resin or a thermosetting resin bonded to one side or both sides and a SiO or SiO 2 film is further bonded to said coating film, and the information-recording layer is attached to the SiO or SiO 2 film.
Claim 12
Dependent Claim
28 words
An optical recording medium according to claim 3, 7, 4 or 9, wherein the coating film of a radiation-curable resin has a pencil hardness of 4H or more.
Claim 13
Dependent Claim
21 words
An optical recording medium according to claim 2, 7, 4 or 9, wherein the radiation-curable resin is an ultraviolet ray-curable resin.
Claim 14
Dependent Claim
45 words
An optical recording medium according to claim 3, 7, 4 or 9, wherein the transparent substrate has a coating film of a radiation-curable resin, a thermosetting resin or a mixture thereof on both sides and the coating films are of the same kind of resin.
Claim 15
Dependent Claim
44 words
An optical recording medium according to claim 3, 7, 4 or 9, wherein the transparent substrate has a coating film of a radiation-curable resin, a thermosetting resin or a mixture thereof on both sides, and the coating films are of different kinds of resins.
Claim 16
Dependent Claim
43 words
An optical recording medium according to claim 3, 7, 4 or 9, wherein the transparent substrate has a coating film of a thermosetting resin on one side or both sides and the coating film is a hardened coating film of a melamine resin.
References Cited (Backward Citations)
JPS5922248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |