US3630772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic memory film
Assignee: Agfa Gevaert AG
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Filing: 1969-07-16
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Granted: 1971-12-28
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Expires: 1989-07-16
Abstract
Abstract A lubricant is incorporated in the coating of a magnetic memory film which contains a neutral ester of a 2-20 carbon dicarboxylic acid with an aliphatic, monofunctional alcohol having 4-18 carbon atoms. The lubricant increases the stability of still pictures recorded on the film, in particular in case of scanning with mumetal heads.
Inventors
- 👤 Bernhard Seidel
- 👤 Hans-Heinrich Credner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31786
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The magnetizable memory film of claim 1, wherein the lubricant is a diester of adipic, sebacic or succinic acid.
Claim 2
Dependent Claim
31 words
The magnetizable memory film of claim 1, wherein the lubricant is a diester containing between 20 and 34 carbon atoms formed of dicarboxylic acids having from four to 10 carbon atoms.
Claim 3
Dependent Claim
15 words
The magnetizable memory film of claim 1, wherein the lubricant is ditetradecylester of succinic acid.
Claim 4
Dependent Claim
15 words
The magnetizable memory film of claim 1, wherein the lubricant is di-n-octylester of adipic acid.
Claim 5
Dependent Claim
42 words
The magnetizable memory film of claim 1, wherein the binding agent is polyvinyl chloride, a mixed polymerizate of polyvinyl chloride with polyvinyl alcohol and polyvinyl acetate, a polyamide, a mixed polymerizate of acrylonitrile and styrene, a polyurethane, a polyester or polyvinylidene chloride.
Claim 6
Dependent Claim
19 words
The magnetizable memory film of claim 1, which in addition to the diester contains oleic acid as dispersing agent.
Claim 7
Dependent Claim
19 words
The magnetizable memory film of claim 1, which in addition to the diester contains carbon black as antistatic agent.
Claim 8
Dependent Claim
59 words
The magnetizable memory film of claim 1, wherein the binding agent is a mixed polymerizate of vinylchloride and vinyl acetate and the diester is di-n-octylester of adipic acid or di-n-butylester of adipic acid or didodecylester of adipic acid and which in addition contains a mixture of primary and secondary phosphOric acid polyglycol esters and oleic acid as dispersing agents.
References Cited (Backward Citations)
US3247017A
Cited
US3274111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |