US2709230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical information storage means
Assignee: National Research Development Corp UK
•
Filing: 1953-05-08
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Granted: 1955-05-24
•
Expires: 1973-05-08
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
- 👤 Kilburn Tom
- 👤 Tootill Geoffrey Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60; G; G11; G11C; G11C11/00; G11C11/21; G11C11/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2034704A
Cited
US2434264A
Cited
US2440301A
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US2454410A
Cited
US2439321A
Cited
US2451005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |