US4503125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective overcoating for magnetic recording discs and method for forming the same
Assignee: Xebec Inc
•
Filing: 1981-06-05
•
Granted: 1985-03-05
•
Expires: 2001-06-05
Abstract
Abstract A protective overcoating is disclosed for a magnetic alloy thin-film recording disc that includes a magnetic alloy film formed on a disc-shaped substrate or coated substrate. The protective overcoating is formed by first sputtering onto the magnetic medium an interfacial layer of titanium, and then sputtering onto the titanium a layer of carbon. The sputtered carbon provides wear-resisting lubricity, while the titanium interface promotes the adhesion of the sputtered carbon to the magnetic medium of the recording disc.
Inventors
- 👤 Carl W. Nelson
- 👤 Michael B. Vye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/62; G11B5/72; G11B5/726; G11B5/7262; G11B5/7264; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F41/00; H01F41/32; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12236; Y10T428/12243; Y10T428/12465; Y10T428/12493; Y10T428/12535; Y10T428/12625; Y10T428/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
A protective overcoating for a magnetic alloy thin-film recording disc that includes a disc-shaped base over which is formed a magnetic alloy film to provide a magnetic recording medium, comprising: a. an interfacial layer of titanium bondable to both the magnetic medium of the recording disc and to carbon; and b. a layer of carbon formed by sputter deposition over said interfacial layer.
Claim 2
Dependent Claim
63 words
A protective overcoating for a magnetic alloy thin-film recording disc that includes a disc-shaped base over which is formed a magnetic alloy film to provide a magnetic recording medium, comprising: a. an interfacial layer of titanium bondable to both the magnetic medium of the recording disc and to carbon; and b. a layer of carbon formed by sputter deposition over said interfacial layer.
Claim 3
Dependent Claim
20 words
The protective overcoating defined in claim 1 wherein said interfacial layer comprises a layer of titanium formed by sputter deposition.
Claim 4
Dependent Claim
59 words
A magnetic recording disc comprising: a. a disc-shaped base; b. a film of a cobalt ferrimagnetic alloy formed on said base so as to provide a magnetic recording medium; c. an interfacial layer of titanium bondable to both the cobalt ferrimagnetic alloy and to carbon; and d. a layer of carbon formed by sputter deposition over said interfacial layer.
Claim 5
Dependent Claim
59 words
A magnetic recording disc comprising: a. a disc-shaped base; b. a film of a cobalt ferrimagnetic alloy formed on said base so as to provide a magnetic recording medium; c. an interfacial layer of titanium bondable to both the cobalt ferrimagnetic alloy and to carbon; and d. a layer of carbon formed by sputter deposition over said interfacial layer.
Claim 6
Dependent Claim
30 words
The magnetic recording disc defined in claim 3 wherein said base comprises: a. a substrate comprising aluminum; and b. a coating of a nonmagnetic nickel alloy formed on said substrate.
Claim 7
Independent Claim
68 words
A method for forming a protective overcoating for a magnetic recording disc of the type having a disc-shaped base over which is formed a magnetic alloy film to provide a magnetic recording medium, comprising the steps of: a. forming onto the magnetic medium an interfacial layer of titantium bondable to the magnetic medium and to carbon; and b. thereafter, sputtering a layer of carbon onto said interfacial layer.
Claim 8
Independent Claim
68 words
A method for forming a protective overcoating for a magnetic recording disc of the type having a disc-shaped base over which is formed a magnetic alloy film to provide a magnetic recording medium, comprising the steps of: a. forming onto the magnetic medium an interfacial layer of titantium bondable to the magnetic medium and to carbon; and b. thereafter, sputtering a layer of carbon onto said interfacial layer.
Claim 9
Dependent Claim
41 words
The method defined in claim 5 wherein the step of forming onto the magnetic medium an interfacial layer comprises the step of: a. sputtering onto the magnetic medium an interfacial layer of titanium bondable to the magnetic medium and to carbon.
References Cited (Backward Citations)
US3472751A
Cited
US3471272A
Cited
US4052738A
Cited
US4069360A
Cited
US4411963A
Cited
JPS5433521A
Cited
US4224381A
Cited
FR2461997A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |