US4069360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record member and process for manufacturing the same
Assignee: NEC Corp
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Filing: 1976-10-22
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Granted: 1978-01-17
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Expires: 1996-10-22
Abstract
Abstract Magnetic storage means which may be a disc having a magnetic storage layer coated with a protective layer. The protective layer, which is preferably an inorganic oxide material, protects the magnetic storage layer from corrosion. A lubricant is applied to the protective layer and serves to reduce wearing due to frictional drag between the disc and a cooperating magnetic head (or heads). The lubricant is oriented so as to make very good adherence with the oxide sublayer and thereby prevent removal of the lubricant through continued use and/or cleaning.
Inventors
- 👤 Masahiro Yanagisawa
- 👤 Yoji Suganuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:57
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/72; G11B5/725; G11B5/726; G11B5/7262; G11B5/7264; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12451; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12597; Y10T428/12771; Y10T428/12861; Y10T428/12944; Y10T428/31504; Y10T428/31536; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
106 words
A magnetic record member, comprising: an alloy disc having a slightly topographical surface of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc; a non-magnetic alloy layer coated on said surface of said alloy disc, said alloy having a surface polished to a mirror finish; a magnetic metal thin film medium coated on said polished surface of said non-magnetic alloy layer; an amorphous inorganic oxide layer coated on said medium; a silicon containing lubricant layer coated on said surface of said oxide layer and oriented so as to adhere to said oxide layer.
Claim 2
Dependent Claim
106 words
A magnetic record member, comprising: an alloy disc having a slightly topographical surface of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc; a non-magnetic alloy layer coated on said surface of said alloy disc, said alloy having a surface polished to a mirror finish; a magnetic metal thin film medium coated on said polished surface of said non-magnetic alloy layer; an amorphous inorganic oxide layer coated on said medium; a silicon containing lubricant layer coated on said surface of said oxide layer and oriented so as to adhere to said oxide layer.
Claim 3
Dependent Claim
15 words
The record member of claim 1, wherein said lubricant layer comprises a silicon based oil.
Claim 4
Dependent Claim
16 words
The record member of claim 1, wherein said lubricant layer comprises a silicon type-surface coupling agent.
Claim 5
Dependent Claim
13 words
The record member of claim 1, wherein said oxide layer is a polysilicate.
Claim 6
Dependent Claim
16 words
The record member of claim 1, wherein said polysilicate consists of a condensated polymer of tetrahydroxysilane.
Claim 7
Dependent Claim
31 words
The record member of claim 1 wherein said amorphous inorganic oxide layer is chosen from the group of quartz glass, silicate glass, borate glass, borosilicate glass, phosphate glass or amorphous alumina.
Claim 8
Dependent Claim
18 words
The record member of claim 1, wherein said polished surface has a center line average height of 0.04microns.
Claim 9
Dependent Claim
90 words
A magnetic record member, comprising: an alloy disc whose surface is polished to a mirror finish, said surface having a topography of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc; a magnetic thin film medium coated on said polished surface of said alloy disc; an amorphous inorganic oxide layer coated on said medium; a silicon containing lubricant layer formed on a surface of said oxide layer and oriented so as to adhere to said oxide layer.
Claim 10
Dependent Claim
90 words
A magnetic record member, comprising: an alloy disc whose surface is polished to a mirror finish, said surface having a topography of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc; a magnetic thin film medium coated on said polished surface of said alloy disc; an amorphous inorganic oxide layer coated on said medium; a silicon containing lubricant layer formed on a surface of said oxide layer and oriented so as to adhere to said oxide layer.
Claim 11
Dependent Claim
15 words
The record member of claim 8, wherein said lubricant layer comprises a silicon based oil.
Claim 12
Dependent Claim
16 words
The record member of claim 8, wherein said lubricant layer comprises a silicon type-surface coupling agent.
Claim 13
Dependent Claim
13 words
The record member of claim 8, wherein said oxide layer is a polysilicate.
Claim 14
Dependent Claim
15 words
The record member of claim 11, wherein said polysilicate is a condensated polymer of tetrahydroxysilane.
Claim 15
Dependent Claim
31 words
The record member of claim 8, wherein said amorphous inorganic oxide layer is chosen from the group of quartz glass, silicate glass, borate glass, borosilicate glass phosphate glass or amorphous alumina.
Claim 16
Dependent Claim
19 words
The record member of claim 8, wherein said polished surface has a center line average height of 0.04 microns.
Claim 17
Dependent Claim
119 words
A process for manufacturing a magnetic record member, comprising the steps of: providing an alloy disc having a non-magnetic alloy layer coated on one surface thereof, said one surface of said alloy disc having a topography of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc, said non-magnetic alloy layer having a surface polished to a mirror finish; forming a magnetic metal thin film medium on said polished surface; forming an amorphous inorganic oxide layer on said medium; applying a silicon containing lubricant onto a surface of said oxide layer, said lubricant having an orientation which will cause said lubricant to adhere to said oxide layer.
Claim 18
Dependent Claim
119 words
A process for manufacturing a magnetic record member, comprising the steps of: providing an alloy disc having a non-magnetic alloy layer coated on one surface thereof, said one surface of said alloy disc having a topography of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc, said non-magnetic alloy layer having a surface polished to a mirror finish; forming a magnetic metal thin film medium on said polished surface; forming an amorphous inorganic oxide layer on said medium; applying a silicon containing lubricant onto a surface of said oxide layer, said lubricant having an orientation which will cause said lubricant to adhere to said oxide layer.
Claim 19
Dependent Claim
12 words
The process of claim 15 wherein said oxide layer is a polysilicate.
Claim 20
Dependent Claim
15 words
The process of claim 16 wherein said polysilicate consists of a condensated polymer of tetrahydroxysilane.
Claim 21
Dependent Claim
30 words
The process of claim 15 wherein said amorphous inorganic oxide layer is chosen from the group of quartz glass, silicate glass, borate glass, borosilicate glass, phosphate glass or amorphous alumina.
Claim 22
Dependent Claim
15 words
The process of claim 15 further including the step of baking said disc thus treated.
Claim 23
Dependent Claim
108 words
A process for manufacturing a magnetic record member comprising the steps of: providing an alloy disc whose surface is polished to a mirror finish, the surface of said disc having a topography of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc; forming a magnetic metal thin medium on said surface of said disc; forming an amorphous inorganic oxide layer on said medium; applying a silicon containing lubricant having an orientation to a surface of said oxide layer; making said disc thus treated so that said lubricant is caused to adhere to said oxide layer.
Claim 24
Dependent Claim
108 words
A process for manufacturing a magnetic record member comprising the steps of: providing an alloy disc whose surface is polished to a mirror finish, the surface of said disc having a topography of not more than 50 microns in the circumferential direction and not more than 10 microns in the radial direction of said disc; forming a magnetic metal thin medium on said surface of said disc; forming an amorphous inorganic oxide layer on said medium; applying a silicon containing lubricant having an orientation to a surface of said oxide layer; making said disc thus treated so that said lubricant is caused to adhere to said oxide layer.
Claim 25
Dependent Claim
12 words
The process of claim 20, wherein said oxide layer is a polysilicate.
Claim 26
Dependent Claim
15 words
The process of claim 21, wherein said polysilicate consists of a condensated polymer of tetrahydroxysilane.
Claim 27
Dependent Claim
30 words
The process of claim 20, wherein said amorphous inorganic oxide layer is chose from the group of quartz glass, silicate glass, borate glass, borosilicate glass, phosphate glass or amorphous alumina.
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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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |