US2794937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic information-storing devices
Assignee: National Research Development Corp UK
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Filing: 1950-11-07
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Granted: 1957-06-04
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Expires: 1970-11-07
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
- 👤 Kilburn Tom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:23
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60
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) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |