US4075672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording members
Assignee: EMAG LLC
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Filing: 1976-02-09
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Granted: 1978-02-21
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Expires: 1996-02-09
Abstract
Abstract An improved magnetic recording member of the disc type. The article of the invention is formed, preferably, of metallic magnetic particles oriented in a vertical direction. This combination overcomes existing limitations on (a) disc products, and (2) the preferred metallic particles heretofore known.
Inventors
- 👤 William A. Manly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70605; G11B5/70621; G11B5/84; G11B5/842; G11B5/845; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A magnetic recording member of the floppy disk type consisting essentially of a substrate and a magnetic recording layer of up to about 100 microinches in thickness and comprising metallic magnetic recording particles, dispersed in a binder, said particles oriented in a direction normal to the plane of the surface of said disk.
Claim 2
Dependent Claim
53 words
A magnetic recording member of the floppy disk type consisting essentially of a substrate and a magnetic recording layer of up to about 100 microinches in thickness and comprising metallic magnetic recording particles, dispersed in a binder, said particles oriented in a direction normal to the plane of the surface of said disk.
Claim 3
Dependent Claim
37 words
A magnetic recording member as defined in claim 1 wherein said magnetic recording member particles are predominantly cobolt and exhibit a squareness value in the direction normal to the surface of the medium of at least 0.65.
Claim 4
Dependent Claim
35 words
A magnetic recording media as defined in claim 1 wherein said magnetic particles are predominantly cobalt and have a squareness value, in the direction normal to the surface of the medium, of at least 0.72.
Claim 5
Dependent Claim
59 words
In a process of making a recording member of the floppy disc type, the improvement comprising the steps of a. coating the surface of substrate with magnetic composition comprising metallic, ferromagnetic particles in a binder and having thickness of up to about 100 microinches. b. magnetically orienting said particles in a direction normal to the plane of said substrates.
Claim 6
Dependent Claim
59 words
In a process of making a recording member of the floppy disc type, the improvement comprising the steps of a. coating the surface of substrate with magnetic composition comprising metallic, ferromagnetic particles in a binder and having thickness of up to about 100 microinches. b. magnetically orienting said particles in a direction normal to the plane of said substrates.
Claim 7
Dependent Claim
32 words
A process as defined in claim 4 wherein said particles are predominantly cobalt and have a squareness value, in the direction normal to the surface of the medium, of at least 0.72.
References Cited (Backward Citations)
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |