Patent US4188434A successfully refreshed from Google Patents.
US4188434A
Expired / Lapsed
US
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Lubricant for a magnetic member
Assignee: Rocky Mountain Magnetics Inc
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Filing: 1978-05-15
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Granted: 1980-02-12
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Expires: 1998-05-15
Abstract
Abstract A magnetic record, such as a magnetic disc, has a smooth continuous layer of solid lubricant mixed with liquid lubricant. The lubricating layer is applied by spraying the magnetic record with a carrier in which the solid and liquid lubricants are dissolved. In the preferred embodiment, tetrafluoroethylene telomer, a solid lubricant, is applied to a magnetic disc and then buffed. Perfluoroalkylpolyether, a liquid lubricant, is then applied and buffed. The lubricants are dissolved in a carrier of trichlorotrifluoroethane.
Inventors
- 👤 Thomas J. Loran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/72; G11B5/725; G11B5/7253; G11B5/7257; G11B5/726; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31801
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A magnetic record member for recording and reproducing signals therefrom comprising: a substrate of said magnetic record member; and a smooth continuous layer of solid lubricant on said substrate, a smooth continuous layer of luquid lubricant on top of the layer of solid lubricant, each of said layers having a thickness of between 1/10 microinches and twenty microinches.
Claim 2
Dependent Claim
58 words
A magnetic record member for recording and reproducing signals therefrom comprising: a substrate of said magnetic record member; and a smooth continuous layer of solid lubricant on said substrate, a smooth continuous layer of luquid lubricant on top of the layer of solid lubricant, each of said layers having a thickness of between 1/10 microinches and twenty microinches.
Claim 3
Dependent Claim
28 words
The magnetic record member recited in claim 1 wherein said solid and liquid lubricants are mixed in the ratio ranging from about 0.1:1 to about 1:0.1 by weight.
Claim 4
Dependent Claim
22 words
Themagnetic record member recited in claim 1 wherein solid and liquid lubricant are mixed in the ratio of approximately 1:1 by weight.
Claim 5
Dependent Claim
14 words
The magnetic record member recited in claim 1 wherein said liquid lubricant is perfluoroalkylpolyether.
Claim 6
Dependent Claim
15 words
The magnetic record member recited in claim 1 wherein said solid lubricant is tetrafluoroethylene telomer.
Claim 7
Dependent Claim
26 words
The magnetic record member recited in claim 1 wherein said liquid lubricant is selected from the group comprising: fluoroalkylpolyethers, chlorofluorocarbons, refined and synthetic hydrocarbons and ethers.
Claim 8
Dependent Claim
22 words
The record member recited in claim 1 wherein said solid lubricant is selected from the group including waxes, tetrafluoroethylene telomer, and tetrafluoroethylene.
Claim 9
Independent Claim
74 words
The method of lubricating a magnetic record member comprising: providing a magnetic record member substrate; dispersing solid lubricant in a carrier; dispersing liquid lubricant in a carrier; and spraying said solid lubricant, and said liquid lubricant, and their carrier onto said substrate in separate layers with the liquid lubricant on top of a layer of solid lubricant on said substrate, the thickness of each of said layers being between 1/10 microinches and twenty microinches.
Claim 10
Independent Claim
74 words
The method of lubricating a magnetic record member comprising: providing a magnetic record member substrate; dispersing solid lubricant in a carrier; dispersing liquid lubricant in a carrier; and spraying said solid lubricant, and said liquid lubricant, and their carrier onto said substrate in separate layers with the liquid lubricant on top of a layer of solid lubricant on said substrate, the thickness of each of said layers being between 1/10 microinches and twenty microinches.
Claim 11
Dependent Claim
20 words
The method recited in claim 8 wherein perfluoroalkylpolyether liquid lubricant and tetrafluoroethylene telomer solid lubricant are dissolved in trichlorotrifluoroethane carrier.
Claim 12
Dependent Claim
17 words
The method recited in claim 8 wherein said layer of solid and liquid lubricants includes anti-static agents.
Claim 13
Dependent Claim
15 words
The method recited in claim 8 further comprising: buffing after the application of each layer.
Claim 14
Dependent Claim
14 words
The method recited in claim 8 wherein said member is a magnetic recording disc.
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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) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |