Patent US4832992A successfully refreshed from Google Patents.
US4832992A
Expired / Lapsed
US
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Process for the preparation of information recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1987-12-23
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Granted: 1989-05-23
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Expires: 2007-12-23
Abstract
Abstract A process for preparing an information recording medium in the form of an optical disc comprising a substrate and a recording layer. The recording layer is formed on the substrate by coating a dye solution which comprises a dye dissolved in a solvent of a fluorine-containing compound over the substrate, and drying thus coated layer.
Inventors
- 👤 Masao Yabe
- 👤 Yoshio Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:09
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A process for the preparation of an information recording medium which comprises the steps of: coating a dye in a solvent containing at least 5 wt.% of a fluorine-containing compound selected from the group consisting of a fluorinated alcohol, a fluorine-substituted ketone, a fluorine-substituted ester, fluorine-substituted benzene, a fluorine-substituted amide, a fluorinated ether and a fluorine-substitute carboxylic acid over a substrate of a polymer selected from the group consisting of polycarbonate, polymethyl methyacrylate, an epoxy resin, amorphous polyolefin, polyester and polyvinyl chloride to form a coated layer; and drying the coated layer to form a recording layer for writing or reading information by means of a laser beam.
Claim 2
Dependent Claim
108 words
A process for the preparation of an information recording medium which comprises the steps of: coating a dye in a solvent containing at least 5 wt.% of a fluorine-containing compound selected from the group consisting of a fluorinated alcohol, a fluorine-substituted ketone, a fluorine-substituted ester, fluorine-substituted benzene, a fluorine-substituted amide, a fluorinated ether and a fluorine-substitute carboxylic acid over a substrate of a polymer selected from the group consisting of polycarbonate, polymethyl methyacrylate, an epoxy resin, amorphous polyolefin, polyester and polyvinyl chloride to form a coated layer; and drying the coated layer to form a recording layer for writing or reading information by means of a laser beam.
Claim 3
Dependent Claim
14 words
The process as claimed in claim 1, wherein said substrate is made of polycarbonate.
Claim 4
Dependent Claim
44 words
The process as claimed in claim 1 wherein said fluorine-containing compound is a fluorinated alcohol having the formula (I): A--CH.sub.2 OH (I) in which A is CF 3 or H(CF 2 .CF 2 ) n wherein n is an integer of 1 to 3.
Claim 5
Dependent Claim
50 words
The process as claimed in claim 1, wherein said fluorine-containing compound is a fluorine-substituted ketone having the formula (II): ##STR40## in which each of A and B is a substituted or unsubstituted alkyl or aryl group, and at least one of A and B contains at least one fluorine atom.
Claim 6
Dependent Claim
50 words
The process as claimed in claim 1, wherein said fluorine-containing compound is a fluorine-substituted ester having the formula (III): ##STR41## in which each of A and B is a substituted or unsubstituted alkyl or aryl group, and at least one of A and B contains at least one fluorine atom.
Claim 7
Dependent Claim
44 words
The process as claimed in claim 1, wherein said fluorine-containing compound is a fluorine-substituted benzene having the formula (IV): ##STR42## in which R 1 is a fluorine atom, and each of R 2 to R 6 is hydrogen, chlorine, bromine or an alkyl group.
Claim 8
Dependent Claim
24 words
The process as claimed in claim 1, wherein said dye is a cyanine dye or a mixture of a cyanine dye and other dye.
Claim 9
Dependent Claim
16 words
The process as claimed in claim 1, wherein said solvent consists essentially of a fluorine-containing compound.
Claim 10
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.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |