US4197357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording element in which a salt of an amine and a phosphoric acid ester are used as a dispersion agent
Assignee: US Philips Corp
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Filing: 1977-12-15
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Granted: 1980-04-08
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Expires: 1997-12-15
Abstract
Abstract An improved magnetic recording composition employing as a novel dispersion agent a salt of an amine and a mono- or diester of phosphoric acid with a higher olefinic alcohol or alkoxylated derivatives of the same.
Inventors
- 👤 Hendrikus F. Huisman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; C; C09; C09K; C09K23/00; C09K23/14; G11B5/7013; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
In a magnetic recording element comprising a carrier containing a dispersion agent and finely distributed magnetizable particles, the improvement wherein the dispersion agent is a salt of an amine and a mono- and/or diester of phosphoric acid with a olefinic alcohol of 12-22 of carbon atoms or with an alkoxylated derivative of said olefinic alcohol.
Claim 2
Dependent Claim
55 words
In a magnetic recording element comprising a carrier containing a dispersion agent and finely distributed magnetizable particles, the improvement wherein the dispersion agent is a salt of an amine and a mono- and/or diester of phosphoric acid with a olefinic alcohol of 12-22 of carbon atoms or with an alkoxylated derivative of said olefinic alcohol.
Claim 3
Dependent Claim
18 words
The magnetic recording element of claim 1 wherein the alcohol is ethoxylated with up to 30 ethoxy groups.
Claim 4
Dependent Claim
19 words
The magnetic recording element of claim 2 wherein the phosphoric acid ester is of the formulae ##STR2## wherein n=5-18.
Claim 5
Dependent Claim
27 words
The magnetic recording element of claim 2 wherein the amine contains at least 3 carbon atoms and has one or more primary, secondary or tertiary amino groups.
Claim 6
Dependent Claim
17 words
The magnetic recording element of claim 2 wherein the dispersion agent contains an excess of the amine.
References Cited (Backward Citations)
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Cited
US3471415A
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US3689317A
Cited
US3692884A
Cited
US3647539A
Cited
US4070522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |