US4343834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing magnetic recording medium
Assignee: TDK Corp
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Filing: 1981-03-26
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Granted: 1982-08-10
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Expires: 2001-03-26
Abstract
Abstract A magnetic recording medium is prepared by a tilt vapor deposition of magnetic particles from a vapor thereof on a substrate running along a peripheral surface of a cylindrical can in vacuum wherein plural cans are used to deposit said magnetic particles at substantially the same tilt angle on each of said cans.
Inventors
- 👤 Seitoku Saito
- 👤 Toshiaki Izumi
- 👤 Hiroshi Sugihara
- 👤 Takayoshi Kobuke
- 👤 Kazuo Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/851
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
235 words
A process for preparing a magnetic recording medium by a tilt vapor deposition of magnetic particles on a substrate, said process comprising: positioning a source of magnetic particle vapor within an evacuated housing; positioning a first cylindrical can in said housing such that the circumferential surface of said can is in opposed relationship to said source; positioning a partition having an aperture between said source and said first can; locating said aperture such that lines extending from said source intersect said circumferential surface of said first can along an arc so as to form acute angles with a normal to the point of said intersection, said angles formed by said arc consisting of the angles between 60 and 85 degrees; positioning a second cylindrical can in said housing such that the circumferential surface of said second can is in opposed relationship to said source; locating said second can on the side of said first can opposite said source such that lines extending from said source are limited by said partition and said first can to intersect said circumferential surface of said second can along an arc so as to form acute angles to a normal to the point of intersection, said angles formed by said arc consisting of the angles between 60 and 85 degrees; and heating said source such that vapors from said source intersect said first and second cans at said acute angles.
Claim 2
Dependent Claim
235 words
A process for preparing a magnetic recording medium by a tilt vapor deposition of magnetic particles on a substrate, said process comprising: positioning a source of magnetic particle vapor within an evacuated housing; positioning a first cylindrical can in said housing such that the circumferential surface of said can is in opposed relationship to said source; positioning a partition having an aperture between said source and said first can; locating said aperture such that lines extending from said source intersect said circumferential surface of said first can along an arc so as to form acute angles with a normal to the point of said intersection, said angles formed by said arc consisting of the angles between 60 and 85 degrees; positioning a second cylindrical can in said housing such that the circumferential surface of said second can is in opposed relationship to said source; locating said second can on the side of said first can opposite said source such that lines extending from said source are limited by said partition and said first can to intersect said circumferential surface of said second can along an arc so as to form acute angles to a normal to the point of intersection, said angles formed by said arc consisting of the angles between 60 and 85 degrees; and heating said source such that vapors from said source intersect said first and second cans at said acute angles.
References Cited (Backward Citations)
US4220117A
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 |