Patent US2840304A successfully refreshed from Google Patents.
US2840304A
Expired / Lapsed
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Data storage arrangements for electronic digital computing machines
Assignee: National Research Development Corp UK
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Filing: 1951-05-17
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Granted: 1958-06-24
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Expires: 1971-05-17
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
- 👤 Kilburn Tom
- 👤 Tootill Geoffrey Colin
- 👤 Pollard Brian Watson
- 👤 Thomas Gordon Eric
- 👤 Edwards David Beverley George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/74; G06F1/00; G06F1/04; G06F15/00; G06F15/76; G06F15/78; G06F3/00; G06F3/06; G06F3/0601; G11; G11C; G11C11/00; G11C11/21; G11C11/23; G06F3/0668; G06F3/0671; G06F3/0673
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |