US4303738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic media having tridecyl stearate lubricant
Assignee: International Business Machines Corp
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Filing: 1980-07-28
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Granted: 1981-12-01
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Expires: 2000-07-28
Abstract
Abstract Magnetic recording media highly loaded with magnetic oxide particles. This media possesses a very smooth surface finish, and in operation exhibits low media wear, as well as low wear of an associated transducing head. This media includes an internal lubricant tridecyl stearate; i.e. a linear, 31-carbon fatty acid ester molecule formed by the ester linking of 13-carbon tridecyl alcohol and 18-carbon stearic acid, the molecule having the composition ##STR1##
Inventors
- 👤 Donald Gini
- 👤 Theodore L. Larson
- 👤 Ronald A. Merten
- 👤 Alex Simonetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
Magnetic recording media comprising a base substrate having a magnetic recording layer thereon, said layer consisting of finely divided magnetic particles dispersed in a binder and including a lubricant having essentially the composition ##STR2##
Claim 2
Dependent Claim
34 words
Magnetic recording media comprising a base substrate having a magnetic recording layer thereon, said layer consisting of finely divided magnetic particles dispersed in a binder and including a lubricant having essentially the composition ##STR2##
Claim 3
Dependent Claim
17 words
The magnetic recording media of claim 1 wherein said magnetic particles comprise γFe 2 O 3 .
Claim 4
Dependent Claim
15 words
The magnetic recording media of claim 1 wherein said magnetic particles comprise CrO 2 .
Claim 5
Dependent Claim
33 words
Flexible magnetic recording media comprising a flexible substrate, a magnetic recording layer on said substrate, said layer having chromium dioxide magnetic particles dispersed in a urethane-based binder matrix, and including tridecyl stearate lubricant.
Claim 6
Dependent Claim
33 words
Flexible magnetic recording media comprising a flexible substrate, a magnetic recording layer on said substrate, said layer having chromium dioxide magnetic particles dispersed in a urethane-based binder matrix, and including tridecyl stearate lubricant.
Claim 7
Dependent Claim
36 words
The magnetic recording media defined in claim 4 wherein the percent by volume of chromium dioxide is about 50%, the percent by volume of tridecyl stearate is about 6%, and the remainder being said binder matrix.
Claim 8
Dependent Claim
34 words
Flexible magnetic recording media comprising a flexible substrate, a magnetic recording layer on said substrate, said layer having gamma iron oxide magnetic particles dispersed in a urethane-based binder matrix, and including tridecyl stearate lubricant.
Claim 9
Dependent Claim
34 words
Flexible magnetic recording media comprising a flexible substrate, a magnetic recording layer on said substrate, said layer having gamma iron oxide magnetic particles dispersed in a urethane-based binder matrix, and including tridecyl stearate lubricant.
Claim 10
Dependent Claim
37 words
The magnetic recording media defined in claim 6 wherein the percent by volume of gamma iron oxide is about 50%, the percent by volume of tridecyl stearate is about 6%, and the remainder being said binder matrix.
References Cited (Backward Citations)
US2954552A
Cited
US2654681A
Cited
US2775566A
Cited
US2804401A
Cited
US2989415A
Cited
US3029157A
Cited
US3139354A
Cited
US3274111A
Cited
US3387993A
Cited
US3492235A
Cited
US3525694A
Cited
US3833412A
Cited
US3547693A
Cited
US3630772A
Cited
US3649541A
Cited
US3987232A
Cited
US3704152A
Cited
US3834870A
Cited
US3926826A
Cited
US3929659A
Cited
US4152469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |