US2840798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic storage system
Assignee: National Research Development Corp UK
•
Filing: 1952-02-19
•
Granted: 1958-06-24
•
Expires: 1972-02-19
Abstract
No abstract record available.
Inventors
- 👤 Cooper Frank
- 👤 Malbon Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
G; G06; G06K; G06K1/00; G11; G11B; G11B5/00; G11B5/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE584739C
Cited
US2573748A
Cited
US2583983A
Cited
US2579125A
Cited
US2587532A
Cited
US2563882A
Cited
US2564403A
Cited
US2537770A
Cited
US2549071A
Cited
US2633564A
Cited
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 |