Patent US2777635A successfully refreshed from Google Patents.
US2777635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic digital computing machines
Assignee: National Research Development Corp UK
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Filing: 1950-08-14
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Granted: 1957-01-15
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Expires: 1970-08-14
Abstract
No abstract record available.
Inventors
- 👤 Tootill Geoffrey Colin
- 👤 Williams Frederic Calland
- 👤 Kilburn Tom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:25
CPC Classifications
G; G06; G06F; G06F12/00; G06F12/02; G06F12/04; G11; G11C; G11C11/00; G11C11/21; G11C11/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |