Patent US2819186A successfully refreshed from Google Patents.
US2819186A
Expired / Lapsed
US
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Magnetic recording tape
Assignee: Reeves Soundcraft Corp
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Filing: 1956-01-19
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Granted: 1958-01-07
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Expires: 1976-01-19
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Franck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
MAGNETIC RECORDING TAPE FOR RECORDING HIGH FREQUENCY IMPULSES ABOVE THE AUDIO FREQUENCY BAND COMPRISING, IN COMBINATION, A SUPPORT CONSISTING OF A STRIP OF NON-MAGNETIC FILM, AND A COMPOSITE COATING THEREON, SAID COATING COMPRISING TWO ADHERENTLY BONDED LAYERS OF RESINOUS POLYMERIC MATERIAL, THE OUTER LAYER BEING RELATIVELY HARD AND BRITTLE AND HAVING FINELY DIVIDED MAGNETIC MATERIAL DISPERED THEREIN IN PROPORTION AT LEAST EQUAL TO 85% OF THE WEIGHT OF THE DRIED LAYER AND THE INNER LAYER BEING NON-MAGNETIC AND RELATIVELY SOFT AND FLEXIBLE, THE THICKNESS OF THE OUTER MAGNETIC LAYER BEING NOT IN EXCESS OF .25 MIL, AND THE THICKNESS OF THE INNER NON-MAGNETIC LAYER BEING AT LEAST EQUAL TO THE THICKNESS OF THE OUTER MAGNETIC LAYER.
Claim 2
Dependent Claim
116 words
MAGNETIC RECORDING TAPE FOR RECORDING HIGH FREQUENCY IMPULSES ABOVE THE AUDIO FREQUENCY BAND COMPRISING, IN COMBINATION, A SUPPORT CONSISTING OF A STRIP OF NON-MAGNETIC FILM, AND A COMPOSITE COATING THEREON, SAID COATING COMPRISING TWO ADHERENTLY BONDED LAYERS OF RESINOUS POLYMERIC MATERIAL, THE OUTER LAYER BEING RELATIVELY HARD AND BRITTLE AND HAVING FINELY DIVIDED MAGNETIC MATERIAL DISPERED THEREIN IN PROPORTION AT LEAST EQUAL TO 85% OF THE WEIGHT OF THE DRIED LAYER AND THE INNER LAYER BEING NON-MAGNETIC AND RELATIVELY SOFT AND FLEXIBLE, THE THICKNESS OF THE OUTER MAGNETIC LAYER BEING NOT IN EXCESS OF .25 MIL, AND THE THICKNESS OF THE INNER NON-MAGNETIC LAYER BEING AT LEAST EQUAL TO THE THICKNESS OF THE OUTER MAGNETIC LAYER.
References Cited (Backward Citations)
CH266143A
Cited
US2699408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |