US2991198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record carriers
Assignee: Agfa Gevaert NV
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Filing: 1957-10-29
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Granted: 1961-07-04
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Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 Abeck Wilhelm
- 👤 Ossenbrunner Armin
- 👤 Klockgether Helfried
- 👤 Geiger Julius
- 👤 Schnell Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:34
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; Y10T428/31507
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
THE METHOD OF MAKING MAGNETIC RECORDING MATERIAL, CHARACTERIZED BY THE STEPS OF CASTING ON A POLISHED SURFACE FROM SOLUTION A LAYER OF BINDER CONTAINING DISPERSED MAGNETIC RECORDING PARTICLES, THE BINDER BEING ESSENTIALLY A THERMOPLASTIC FILM-FORMING POLYESTER OF CARBONIC ACID AND A DI-(MONOHYDROXYARYL) ALKANE, AND THEN CASTING FROM SOLUTION OVER SAID LAYER, A SUPPORTING LAYER ESSENTIALLY OF THERMOPLASTIC FILM-FORMING POLYESTER OF CARBONIC ACID AND A DI-(MONOHYDROXYARYL)-ALKANE TO CAUSE THE TWO LAYERS TO ADHERE TOGETHER.
References Cited (Backward Citations)
US2455652A
Cited
FR954244A
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US2607710A
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US2789965A
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BE546377A
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BE546376A
Cited
US2799666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |