Patent US4944967A successfully refreshed from Google Patents.
US4944967A
Expired / Lapsed
US
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Process for the preparation of information recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1988-12-06
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Granted: 1990-07-31
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Expires: 2008-12-06
Abstract
Abstract A process for the preparation of an information recording medium comprising a substrate and a recording layer for writing and/or reading information by means of a laser beam which is provided on the substrate, wherein said recording layer is formed on the substrate by coating a solution which contains a dye in a solvent containing diacetone alcohol over the substrate to form a dye-coated layer, and drying the coated layer is disclosed. Also disclosed is a process for the preparation of an information recording medium comprising a substrate, an intermediate layer and a recording layer, superposed in order.
Inventors
- 👤 Masao Yabe
- 👤 Yoshio Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:28
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/02; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/26; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A process for the preparation of an information recording medium which comprises the steps of: coating a solution which contains a dye in a solvent containing at least 10 weight % of diacetone alcohol over a polycarbonate substrate having a pregroove thereon; and drying thus coated layer on the substrate to form a recording layer.
Claim 2
Dependent Claim
55 words
A process for the preparation of an information recording medium which comprises the steps of: coating a solution which contains a dye in a solvent containing at least 10 weight % of diacetone alcohol over a polycarbonate substrate having a pregroove thereon; and drying thus coated layer on the substrate to form a recording layer.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein said solvent contains diacetone alcohol at least 50 weight %.
Claim 4
Dependent Claim
63 words
The process as claimed in claim 1, wherein said dye is at least one dye selected from the group consisting of a cyanine dye, a phthalocyanine dye, a pyrylium dye, a thiopyrylium dye, a squarillium dye, an azulenium dye, an indophenol dye, an indoaniline dye, a triphenylmethane dye, a quinone dye, an aminium dye, a diimmonium dye and a metal complex salt dye.
Claim 5
Dependent Claim
61 words
A process for the preparation of an information recording medium which comprises the steps of: coating a solution which contains a polymer in a solvent containing at least 10 weight % of diacetone alcohol over a polycarbonate substrate having a pregroove thereon; drying thus coated layer to form an intermediate layer; and forming an information recording layer on the intermediate layer.
Claim 6
Dependent Claim
61 words
A process for the preparation of an information recording medium which comprises the steps of: coating a solution which contains a polymer in a solvent containing at least 10 weight % of diacetone alcohol over a polycarbonate substrate having a pregroove thereon; drying thus coated layer to form an intermediate layer; and forming an information recording layer on the intermediate layer.
Claim 7
Dependent Claim
19 words
The process as claimed in claim 4, wherein said solvent contains at least 50 wt. % of diacetone alcohol.
Claim 8
Dependent Claim
51 words
The process as claimed in claim 4, wherein said polymer is at least one polymer selected from the group consisting of polymethyl methacrylate, acrylic acid/methacrylic acid copolymer, styrene/maleic anhydride copolymer, styrene/vinyltoluene coploymer, chlorinated polyethylene, chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride, polyimide, vinyl acetate/vinyl chloride copolymer, ethylene/vinyl acetate copolymer, polyethylene, polypropylene, and polycarbonate.
Claim 9
Dependent Claim
65 words
The process as claimed in claim 4, wherein said recording layer contains is at least one dye selected from the group consisting of a cyanine dye, a phthalocyanine dye, a pyrylium dye, a thiopyrylium dye, a squarillium dye, an azulenium dye, an indophenol dye, an indoaniline dye, a triphenylmethane dye, a quinone dye, an aminium dye, a diimmonium dye and a metal complex salt dye.
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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |