Patent US4613548A successfully refreshed from Google Patents.
US4613548A
Expired / Lapsed
US
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Polyphosphazene magnetic tape lube
Assignee: Ethyl Corp
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Filing: 1985-02-11
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Granted: 1986-09-23
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Expires: 2005-02-11
Abstract
Abstract A magnetic recording media containing a normally liquid polyphosphazene lubricant, e.g. low molecular weight linear or cyclic poly-fluoroalkoxy phosphazene mixtures.
Inventors
- 👤 Genevieve S. Lum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:02
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; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/31504
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A magnetic recording media comprising a substrate having a magnetic recording lamina, said lamina comprising magnetic particles and a binder, said lamina being coated or impregnated with a lubricating amount of a low molecular weight, normally liquid phosphazene oligomer, said oligomer being a mixture of linear and/or cyclic phosphazene oligomers containing about 3-20 --P<═N-- units wherein the phosphorus substituents are the same or different and are a mixture of fluoroalkoxy groups having the structure --OCH 2 --(CF 2 ) n CF 2 X wherein n is an integer from 0 to 13 and X is H or F.
Claim 2
Dependent Claim
98 words
A magnetic recording media comprising a substrate having a magnetic recording lamina, said lamina comprising magnetic particles and a binder, said lamina being coated or impregnated with a lubricating amount of a low molecular weight, normally liquid phosphazene oligomer, said oligomer being a mixture of linear and/or cyclic phosphazene oligomers containing about 3-20 --P<═N-- units wherein the phosphorus substituents are the same or different and are a mixture of fluoroalkoxy groups having the structure --OCH 2 --(CF 2 ) n CF 2 X wherein n is an integer from 0 to 13 and X is H or F.
Claim 3
Dependent Claim
18 words
A magnetic recording media of claim 1 wherein substantially all of said phosphorus substituents are said fluoroalkoxy groups.
Claim 4
Dependent Claim
27 words
A magnetic recording media of claim 1 wherein said phosphazene oligomer comprises a major amount of a cyclic phosphazene oligomer containing 3 to about 7 --P<═N-- units.
Claim 5
Dependent Claim
21 words
A magnetic recording media of claim 3 wherein said phosphazene oligomer consists mainly of cyclic phosphazene trimers, tetramers or mixtures thereof.
Claim 6
Dependent Claim
18 words
A magnetic recording media of claim 4 wherein substantially all of said phosphorus substituents are said fluoroalkoxy groups.
Claim 7
Dependent Claim
13 words
A magnetic recording media of claim 5 wherein n is an odd integer.
Claim 8
Dependent Claim
27 words
A magnetic recording media of claim 1 wherein said phosphazene oligomer comprises a major amount of a linear phosphazene oligomer containing 3 to about 20 --P<═N-- units.
Claim 9
Dependent Claim
18 words
A magnetic recording media of claim 7 wherein substantially all of said phosphorus substituents are said fluoroalkoxy groups.
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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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |