US2807728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital data storage systems
Assignee: National Research Development Corp UK
•
Filing: 1951-04-03
•
Granted: 1957-09-24
•
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 14:01
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2294720A
Cited
US2382055A
Cited
US2495790A
Cited
US2402058A
Cited
US2558577A
Cited
US2448830A
Cited
US2668877A
Cited
US2541247A
Cited
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 |