Patent US3063147A successfully refreshed from Google Patents.
Patent US2807728A successfully refreshed from Google Patents.
US2807728A
Expired / Lapsed
US
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Digital data storage systems
Assignee: National Research Development Corp UK
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Filing: 1951-04-03
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Granted: 1957-09-24
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Expires: 1971-04-03
Abstract
No abstract record available.
Inventors
- 👤 Kilburn Tom
- 👤 Williams Frederic Calland
- 👤 Laithwaite Eric Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:44
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/1092; G11; G11C; G11C13/00; G11C13/04; G11C13/048; G11C17/00; G11C17/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2382055A
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US2495790A
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US2402058A
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US2558577A
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US2448830A
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US2668877A
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US2541247A
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US2523328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |