Patent US4454202A successfully refreshed from Google Patents.
US4454202A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1981-10-27
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Granted: 1984-06-12
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Expires: 2001-10-27
Abstract
Abstract A magnetic recording medium having a magnetic paint applied to a base is disclosed. The magnetic paint contains a three-component binder which comprises 30 to 70% of polyurethane having a terminal OH group, 10 to 50% of an epichlorohydrin/diphenylolpropane polycondensate and 10 to 50% of a vinyl chloride/vinyl acetate copolymer, vinyl chloride/vinyl acetate/maleic acid copolymer or vinyl chloride/vinyl acetate/vinyl alcohol copolymer, the percentage being based on the weight of the binder.
Inventors
- 👤 Shigeo Komine
- 👤 Kazuhiko Morita
- 👤 Nobuo Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; C; C08; C08L; C08L75/00; C08L75/04; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31565; Y10T428/31786; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A magnetic recording medium, comprising: a base; and a magnetic paint applied to a surface of said base, said magnetic paint comprising a three-component binder consisting essentially of 30 to 70% of polyurethane having a terminal OH group, 10 to 50% of an epichlorohydrin/diphenylolpropane polycondensate and 10 to 50% of a copolymer selected from the group consisting of a vinyl chloride/vinyl acetate copolymer, vinyl chloride/vinyl acetate/maleic acid copolymer and vinyl chloride/vinyl acetate/vinyl alcohol copolymer, the percentages being based on the weight of the binder.
Claim 2
Dependent Claim
84 words
A magnetic recording medium, comprising: a base; and a magnetic paint applied to a surface of said base, said magnetic paint comprising a three-component binder consisting essentially of 30 to 70% of polyurethane having a terminal OH group, 10 to 50% of an epichlorohydrin/diphenylolpropane polycondensate and 10 to 50% of a copolymer selected from the group consisting of a vinyl chloride/vinyl acetate copolymer, vinyl chloride/vinyl acetate/maleic acid copolymer and vinyl chloride/vinyl acetate/vinyl alcohol copolymer, the percentages being based on the weight of the binder.
Claim 3
Dependent Claim
17 words
A magnetic recording medium as claimed in claim 1, wherein said copolymer is vinyl chloride/vinyl acetate copolymer.
Claim 4
Dependent Claim
18 words
A magnetic recording medium as claimed in claim 1, wherein said copolymer is vinyl chloride/vinyl acetate/maleic acid copolymer.
Claim 5
Dependent Claim
18 words
A magnetic recording medium as claimed in claim 1, wherein said copolymer is vinyl chloride/vinyl acetate/vinyl alcohol copolymer.
Claim 6
Dependent Claim
14 words
A magnetic recording medium as claimed in claim 1, further comprising a curing agent.
Claim 7
Dependent Claim
25 words
A magnetic recording medium as claimed in claim 5, wherein said curing agent is added in an amount of 10 to 30 parts by weight.
Claim 8
Dependent Claim
22 words
A magnetic recording medium as claimed in claim 1 wherein said 3-component binder consists of said polyurethane, said polycondensate and said copolymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |