Patent JPS607664A successfully refreshed from Google Patents.
US4650720A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1984-04-11
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Granted: 1987-03-17
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Expires: 2004-04-11
Abstract
Abstract A magnetic recording medium is disclosed which comprises a non-magnetic support having provided thereon a magnetic recording layer and a backing layer on the opposite surface thereof, wherein said magnetic recording layer contains a fatty acid, said backing layer contains a cellulose resin, and said non-magnetic support has a Young's modulus of 7×10 10 to 1×10 13 dyn/cm 2 .
Inventors
- 👤 Nobutaka Yamaguchi
- 👤 Takahito Miyoshi
- 👤 Toshimitu Okutu
- 👤 Noburo Hibino
- 👤 Eiichi Tadokoro
- 👤 Masaaki Fujiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/735; G11B5/68; G11B5/70; G11B5/71; G11B5/739; G11B5/73911; G11B5/73917; G11B5/73923; G11B5/73927; G11B5/73929; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic recording layer and a backing layer on the opposite surface thereof, wherein said magnetic recording layer contains a fatty acid selected from the group consisting of lauric acid, palmitic acid, stearic acid and oleic acid in an amount of 0.01 to 10 parts by weight per 100 parts by weight of ferromagnetic particles, said backing layer contains a cellulose resin, and said non-magnetic support has a Young's modulus of 8×10 10 to 8×10 11 dyn/cm 2 in the direction in which recording is carried out.
Claim 2
Dependent Claim
98 words
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic recording layer and a backing layer on the opposite surface thereof, wherein said magnetic recording layer contains a fatty acid selected from the group consisting of lauric acid, palmitic acid, stearic acid and oleic acid in an amount of 0.01 to 10 parts by weight per 100 parts by weight of ferromagnetic particles, said backing layer contains a cellulose resin, and said non-magnetic support has a Young's modulus of 8×10 10 to 8×10 11 dyn/cm 2 in the direction in which recording is carried out.
Claim 3
Dependent Claim
33 words
The magnetic recording medium as claimed in claim 1, wherein said fatty acid is contained in an amount of 0.1 to 5 parts by weight per 100 parts by weight of ferromagnetic particles.
Claim 4
Dependent Claim
17 words
The magnetic recording medium as claimed in claim 1, wherein said cellulose resin is a cellulose derivative.
Claim 5
Dependent Claim
36 words
The magnetic recording medium as claimed in claim 1, wherein said cellulose derivative is selected from the group consisting of cellulose acetate, butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose acetate propionate, nitrocellulose, and mixtures thereof.
Claim 6
Dependent Claim
39 words
The magnetic recording medium as claimed in claim 1, wherein said cellulose resin is contained in an amount of 1 to 100 parts by weight per 100 parts by weight of ferromagnetic fine particles in the magnetic recording layer.
Claim 7
Dependent Claim
39 words
The magnetic recording medium as claimed in claim 5, wherein said cellulose resin is contained in an amount of 3 to 50 parts by weight per 100 parts by weight of ferromagnetic fine particles in the magnetic recording layer.
Claim 8
Dependent Claim
39 words
The magnetic recording medium as claimed in claim 6, wherein said cellulose resin is contained in an amount of 5 to 25 parts by weight per 100 parts by weight of ferromagnetic fine particles in the magnetic recording layer.
Claim 9
Dependent Claim
29 words
The magnetic recording medium as claimed in claim 1, wherein said non-magnetic support has a Young's modulus of 8×10 10 to 8×10 11 dyn/cm 2 in the machine direction.
Claim 10
Dependent Claim
29 words
The magnetic recording medium as claimed in claim 1, wherein said non-magnetic support has a Young's modulus of 8×10 10 to 8×10 11 dyn/cm 2 in the transverse direction.
Claim 11
Dependent Claim
21 words
The magnetic recording medium as claimed in claim 1, wherein said non-magnetic support is a plastic or a metal thin film.
Claim 12
Dependent Claim
16 words
The magnetic recording medium as claimed in claim 10, wherein said non-magnetic support is a plastic.
Claim 13
Dependent Claim
28 words
The magnetic recording medium as claimed in claim 11, wherein said plastic is selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide and triacetyl cellulose.
Claim 14
Dependent Claim
15 words
The magnetic recording medium as claimed in claim 12, wherein said plastic is polyethylene terephthalate.
Claim 15
Dependent Claim
28 words
The magnetic recording medium as claimed in claim 11, wherein said plastic is provided on the surface thereof a vacuum deposited layer of aluminum, copper, nickel or zinc.
References Cited (Backward Citations)
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |