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US5084319A
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Disk-shaped magnetic recording media, their production and information stores containing these recording media
Assignee: BASF SE
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Filing: 1989-11-14
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Granted: 1992-01-28
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Expires: 2009-11-14
Abstract
Abstract Disk-shaped magnetic recording media essentially consisting of a flexible substrate, a thin ferromagnetic metal film applied to one or both sides and a protective or antifriction layer present on this metal film and essentially consisting of carbon, a process for the production of these recording media and information stores containing these recording media.
Inventors
- 👤 Hartmut Hibst
- 👤 Arend Werner
- 👤 Joachim Hack
- 👤 Heinrich Mannsperger
- 👤 Michael Hitzfeld
- 👤 Werner Grau
- 👤 Guenter Heil
- 👤 Norbert Holl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
A disk-shaped magnetic recording medium consisting essentially of a flexible substrate and a thin ferromagnetic metal film applied to one or both sides and a 10-100 nm thick friction-reducing layer present on this metal film and consisting of carbon, wherein the friction-reducing layer has open micropores which contain a liquid lubricant.
Claim 2
Dependent Claim
51 words
A disk-shaped magnetic recording medium consisting essentially of a flexible substrate and a thin ferromagnetic metal film applied to one or both sides and a 10-100 nm thick friction-reducing layer present on this metal film and consisting of carbon, wherein the friction-reducing layer has open micropores which contain a liquid lubricant.
Claim 3
Dependent Claim
44 words
A disk-shaped magnetic recording medium as claimed in claim 1, wherein the micropore volume fraction of the friction-reducing layer, which fraction is determined by comparison of the layer thicknesses with the mass occupation factor determined by X-ray fluorescence measurement, is from 5 to 60%.
Claim 4
Dependent Claim
78 words
A process for the production of a disk-shaped magnetic recording medium, consisting essentially of a flexible substrate and a thin ferromagnetic metal film layer consisting essentially of carbon having a thickness of 10-100 nm, comprising depositing said carbon layer on said thin ferromagnetic film by means of DC magnetron sputtering under a vacuum pressure of 1×10 -3 to 5×10 -2 mbar of argon whereby pores are formed in said carbon layer and filling said pores with liquid lubricants.
Claim 5
Dependent Claim
78 words
A process for the production of a disk-shaped magnetic recording medium, consisting essentially of a flexible substrate and a thin ferromagnetic metal film layer consisting essentially of carbon having a thickness of 10-100 nm, comprising depositing said carbon layer on said thin ferromagnetic film by means of DC magnetron sputtering under a vacuum pressure of 1×10 -3 to 5×10 -2 mbar of argon whereby pores are formed in said carbon layer and filling said pores with liquid lubricants.
Claim 6
Dependent Claim
96 words
A magnetic information store consisting of a magnetic recording medium as claimed in claim 1 in a protective jacket which is closed on all sides, said jacket consisting of resilient material and having openings for driving and positioning the recording medium and for recording and playback of information and on whose inside, facing the recording medium, is applied a fleece liner impregnated with lubricant, wherein, when the magnetic information store is used, the stock of liquid lubricant in the open micropores of the friction-reducing carbon layer is replenished from the lubricant reservoir of the fleece liner.
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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) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |