US2941901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic impulse record carriers
Assignee: Agfa Gevaert NV
•
Filing: 1956-07-03
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Granted: 1960-06-21
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Expires: 1976-07-03
Abstract
No abstract record available.
Inventors
- 👤 Prill Alphons
- 👤 Bruck Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/716; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A MAGNETIC IMPULSE RECORD MEMBER COMPRISING A SUPPORT AND COATED ON SAID SUPPORT TWO SUPERIMPOSED MAGNETIC RECORDING LAYERS HAVING PULVERULENT MAGNETIC MATERIAL DISPERSED IN A NON-MAGNETIZABLE BINDING AGENT, MAGNETIC MATERIAL OF THE OUTER LAYER BEING FERROMAGNETIC IRON OXIDE FREE OF COBALT, THE MAGNETIC MATERIAL OF THE INNER LAYER BEING A FERROMAGNETIC NON-SINTERED IRON-OXIDE WHEREIN 2.5-4% OF THE IRON ATOMS ARE REPLACED BY COBALT, AND THE OUTER LAYER IS 4 TO 6 NMICRONS THICK.
Claim 2
Dependent Claim
73 words
A MAGNETIC IMPULSE RECORD MEMBER COMPRISING A SUPPORT AND COATED ON SAID SUPPORT TWO SUPERIMPOSED MAGNETIC RECORDING LAYERS HAVING PULVERULENT MAGNETIC MATERIAL DISPERSED IN A NON-MAGNETIZABLE BINDING AGENT, MAGNETIC MATERIAL OF THE OUTER LAYER BEING FERROMAGNETIC IRON OXIDE FREE OF COBALT, THE MAGNETIC MATERIAL OF THE INNER LAYER BEING A FERROMAGNETIC NON-SINTERED IRON-OXIDE WHEREIN 2.5-4% OF THE IRON ATOMS ARE REPLACED BY COBALT, AND THE OUTER LAYER IS 4 TO 6 NMICRONS THICK.
References Cited (Backward Citations)
US2463413A
Cited
GB644639A
Cited
US2689168A
Cited
US2691072A
Cited
US2643130A
Cited
GB717269A
Cited
GB721630A
Cited
FR1107265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |