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Patent US4383000A successfully refreshed from Google Patents.
US4383000A
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Magnetic recording medium
Assignee: Victor Company of Japan Ltd
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Filing: 1981-01-07
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Granted: 1983-05-10
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Expires: 2001-01-07
Abstract
Abstract A magnetic recording medium which comprises a support and a magnetic layer formed on the support which is comprised of a magnetic powder dispersed in a binder and containing a lubricant. The lubricant contains at least as ester of a linear aliphatic acid having 14-18 carbon atoms and an alcohol of the general formula, (CH 3 ) 2 CH--(CH 2 ) n --OH in which n is an integer of from 1 to 5. Preferably, an ester of a linear aliphatic acid having 14-18 carbon atoms and an alcohol of the formula, CH 3 --(CH 2 ) m --CH 2 OH, in which m is an integer of from 2 to 4 is contained.
Inventors
- 👤 Kuniharu Fujiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:39
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; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A magnetic recording medium comprising a support and a magnetic recording layer formed on said support, said magnetic recording layer comprising a magnetic powder dispersed in a binder and including a lubricant which contains at least an ester of an aliphatic acid having 14-18 carbon atoms and an alcohol of the general formula, (CH 3 ) 2 CH(--CH 2 )-- n OH, in which n is an integer of 1 to 5, said ester being contained in an amount of from about 0.2 to 2.5% by weight of said magnetic powder.
Claim 2
Dependent Claim
91 words
A magnetic recording medium comprising a support and a magnetic recording layer formed on said support, said magnetic recording layer comprising a magnetic powder dispersed in a binder and including a lubricant which contains at least an ester of an aliphatic acid having 14-18 carbon atoms and an alcohol of the general formula, (CH 3 ) 2 CH(--CH 2 )-- n OH, in which n is an integer of 1 to 5, said ester being contained in an amount of from about 0.2 to 2.5% by weight of said magnetic powder.
Claim 3
Dependent Claim
15 words
A magnetic recording medium according to claim 1, wherein said aliphatic acid is stearic acid.
Claim 4
Dependent Claim
23 words
A magnetic recording medium according to claim 1, wherein said aliphatic acid is a mixture of stearic acid, myristic acid and palmitic acid.
Claim 5
Dependent Claim
46 words
A magnetic recording medium according to claim 1, wherein said lubricant further comprises an ester of an aliphatic acid and an alcohol of the general formula, CH 3 --(CH 2 ) m --CH 2 OH in which m is an integer of from 2 to 4.
Claim 6
Dependent Claim
27 words
A magnetic recording medium according to claim 4, wherein the last-mentioned aliphatic acid is stearic acid or a mixture of stearic acid, myristic acid and palmitic acid.
Claim 7
Dependent Claim
29 words
A magnetic recording medium according to claim 4, wherein the last-mentioned ester is contained in an amount of from about 0.2 to 2.5% by weight of the magnetic powder.
References Cited (Backward Citations)
DE2535448C3
Cited
US4172176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |