US4781965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1984-10-05
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Granted: 1988-11-01
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Expires: 2004-10-05
Abstract
Abstract A magnetic recording medium is described, comprising a non-magnetic support having coated thereon a non-magnetic layer and a magnetic layer in that order, with the surface roughness of the surface of the support on the side opposite from the magnetic layer being 0.007 μm or more, and the non-magnetic layer being provided by coating and radiation-exposing a compound that is polymerizable by radiation exposure.
Inventors
- 👤 Hiroshi Hashimoto
- 👤 Noburo Hibino
- 👤 Tsutomu Okita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:26
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7026; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24413; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A magnetic recording medium comprising a non-magnetic support having coated thereon a non-magnetic layer and a magnetic layer in that order, with the surface roughness of the surface of the support on the side opposite from the magnetic layer being 0.007 μm or more, cut off of 0.25 mm, where the nonmagnetic layer is provided by coating and radiation-exposing a compound that is polymerizable by radiation exposure, wherein the non-magnetic layer has a surface roughness adjusted by utilizing a leveling effect to a value of 0.005 μm or less on the surface coated with the magnetic layer, and wherein the non-magnetic layer is formed by coating a layer of a composition containing the compound that is polymerizable by radiation exposure which has a viscosity of 300 cP or less, followed by exposiing the coated layer to radiation.
Claim 2
Dependent Claim
137 words
A magnetic recording medium comprising a non-magnetic support having coated thereon a non-magnetic layer and a magnetic layer in that order, with the surface roughness of the surface of the support on the side opposite from the magnetic layer being 0.007 μm or more, cut off of 0.25 mm, where the nonmagnetic layer is provided by coating and radiation-exposing a compound that is polymerizable by radiation exposure, wherein the non-magnetic layer has a surface roughness adjusted by utilizing a leveling effect to a value of 0.005 μm or less on the surface coated with the magnetic layer, and wherein the non-magnetic layer is formed by coating a layer of a composition containing the compound that is polymerizable by radiation exposure which has a viscosity of 300 cP or less, followed by exposiing the coated layer to radiation.
Claim 3
Dependent Claim
33 words
A magnetic recording medium as in claim 1, wherein the surface roughness of the surface of the support on the side opposite from the magnetic layer is from 0.007 μm to 0.5 μm.
Claim 4
Dependent Claim
33 words
A magnetic recording medium as in claim 1, wherein the surface roughness of the surface of the support on the side opposite from the magnetic layer is from 0.015 μm to 0.5 μm.
Claim 5
Dependent Claim
21 words
A magnetic recording medium as in claim 1, wherein the non-magnetic layer has a thickness of from 0.1 to 2 μm.
Claim 6
Dependent Claim
21 words
A magnetic recording medium as in claim 2, wherein the non-magnetic layer has a thickness of from 0.1 to 2 μm.
Claim 7
Dependent Claim
21 words
A magnetic recording medium as in claim 3, wherein the non-magnetic layer has a thickness of from 0.1 to 2 μm.
Claim 8
Dependent Claim
48 words
A magnetic recording medium as in claim 1, wherein the non-magnetic layer is formed by coating a layer of a composition containing a compound that is polymerizable by radiation exposure and which has a viscosity of 100 cP or less, followed by exposing the coated layer to radiation.
Claim 9
Dependent Claim
48 words
A magnetic recording medium as in claim 1, wherein the non-magnetic layer is formed by coating a layer of a composition containing a compound that is polymerizable by radiation exposure and which has a viscosity of 50 cP or less, followed by exposing the coated layer to radiation.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |