US2923642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording tape
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1955-10-19
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Granted: 1960-02-02
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Expires: 1975-10-19
Abstract
No abstract record available.
Inventors
- 👤 Dietrich K Hausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/716; G11B5/718; G11B5/74; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A MAGNETIC TAPE COMPRISING A PAIR OF MAGNETIC RECORDING LAYERS, AND MEANS MAGNETICALLY SHIELDING ONE LAYER FROM THE OTHER, SAID MEANS COMPRISING A LAYER OF ALUMINUM DISPOSED BETWEEN THE MAGNETIC RECORDING LAYERS.
Claim 2
Dependent Claim
32 words
A MAGNETIC TAPE COMPRISING A PAIR OF MAGNETIC RECORDING LAYERS, AND MEANS MAGNETICALLY SHIELDING ONE LAYER FROM THE OTHER, SAID MEANS COMPRISING A LAYER OF ALUMINUM DISPOSED BETWEEN THE MAGNETIC RECORDING LAYERS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |