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US2958855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage devices
Assignee: EMI Ltd
•
Filing: 1958-04-29
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Granted: 1960-11-01
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Expires: 1978-04-29
Abstract
No abstract record available.
Inventors
- 👤 Froggatt Robert Justin
- 👤 Robinson Nigel David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:23
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; G11C11/06014; G11C11/06021; G11C11/06028; G11C11/06042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2844812A
Cited
US2840801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |