Patent US4267203A successfully refreshed from Google Patents.
US4267203A
Expired / Lapsed
US
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Manufacture of magnetic recording media
Assignee: Emtec Magnetics GmbH
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Filing: 1979-10-18
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Granted: 1981-05-12
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Expires: 1999-10-18
Abstract
Abstract A process for the manufacture of magnetic recording media by dispersing a mixture of particulate anisotropic magnetic material and additives in a solution of a polymeric binder in an organic solvent, compressing and then releasing the pressure on the dispersion, thereafter applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field, and drying the coating.
Inventors
- 👤 Herbert Motz
- 👤 Dieter Schaefer
- 👤 Werner Huebner
- 👤 Dieter Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:51
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/71; B01F35/717; B01F35/7176; B01F35/717613; B01F25/00; B01F25/40; B01F25/44; B01F25/441; B01F25/4413; B01F25/442; B01F25/4423; B01F35/71805; G; G11; G11B; G11B5/00; G11B5/84
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
In a process for the manufacture of a magnetic recording medium by dispersing a mixture of particulate anisotropic magnetic material and additives in a solution of a polymeric binder in an organic solvent, applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic materials by means of a magnetic field and drying the coating, the improvement which comprises: subjecting the dispersion, before application to the base, to a pressure of from 98 to 784 bar and immediately thereafter releasing the dispersion under pressure through a valve onto an impact member.
Claim 2
Dependent Claim
94 words
In a process for the manufacture of a magnetic recording medium by dispersing a mixture of particulate anisotropic magnetic material and additives in a solution of a polymeric binder in an organic solvent, applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic materials by means of a magnetic field and drying the coating, the improvement which comprises: subjecting the dispersion, before application to the base, to a pressure of from 98 to 784 bar and immediately thereafter releasing the dispersion under pressure through a valve onto an impact member.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the valve through which the compressed dispersion is released is a nozzle.
Claim 4
Dependent Claim
19 words
The process of claim 1, wherein the valve through which the compressed dispersion is released is an annular gap.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |