US4343831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1981-03-13
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Granted: 1982-08-10
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Expires: 2001-03-13
Abstract
Abstract A process for producing a magnetic recording medium is described comprising applying to a support a coating solution which has ferromagnetic particles dispersed in a solution comprising a binder curable by electron beams and a low-boiling point solvent, irradiating the support with electron beam radiation while the particles remain dispersed uniformly, and evaporating the solvent to dryness.
Inventors
- 👤 Nobuo Tsuji
- 👤 Goro Akashi
- 👤 Masaaki Fujiyama
- 👤 Yasuyuki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/842; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A process for producing a magnetic recording medium comprising applying to a support a coating solution containing ferromagnetic particles dispersed in a solution including a binder curable by electron beam radiation and a lowboiling point solvent, irradiating the support with electron beam radiation while the particles remain dispersed uniformally prior to any substantial evaporation of the solvent, and then evaporating the solvent to dryness.
Claim 2
Dependent Claim
64 words
A process for producing a magnetic recording medium comprising applying to a support a coating solution containing ferromagnetic particles dispersed in a solution including a binder curable by electron beam radiation and a lowboiling point solvent, irradiating the support with electron beam radiation while the particles remain dispersed uniformally prior to any substantial evaporation of the solvent, and then evaporating the solvent to dryness.
Claim 3
Dependent Claim
14 words
A process as in claim 1, wherein said binder is a high-boiling point monomer.
Claim 4
Dependent Claim
17 words
A process as in claim 1, wherein said binder is a mixture of low molecular weight polymers.
Claim 5
Dependent Claim
22 words
A process as in claim 1, wherein said binder is a mixture of a high-boiling point monomer and low molecular weight polymer.
Claim 6
Dependent Claim
25 words
A process as in claim 1, 2, 3, or 4, wherein after evaporating the solvent to dryness the support and resulting coating layer are calendered.
Claim 7
Dependent Claim
19 words
A process as in claim 2 or 4, comprising a high-boiling point monomer having two or more vinyl groups.
Claim 8
Dependent Claim
26 words
A process as in claim 1, 2, 3, or 4, wherein the weight ratio of the magnetic particles to the binder is from 100:10 to 100:400.
Claim 9
Dependent Claim
38 words
A process as in claim 1, 2, 3, or 4, wherein the electron beam radiation is provided at an acceleration voltage of from 0.1 to 2.0 Mrad/sec to provide a total dose of from 0.5 to 20 Mrad.
Claim 10
Dependent Claim
16 words
A process as in claim 8, wherein the acceleration voltage is from 0.2 to 0.6 MeV.
References Cited (Backward Citations)
US3104983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |