Patent US2982947A successfully refreshed from Google Patents.
US2982947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic systems and devices
Assignee: National Research Development Corp UK
•
Filing: 1955-11-21
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Granted: 1961-05-02
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Expires: 1975-11-21
Abstract
No abstract record available.
Inventors
- 👤 Kilburn Tom
- 👤 Hoffman George Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:51
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/45; G; G11; G11B; G11B5/00; G11B5/127; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; G11C11/06078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1788152A
Cited
US2521536A
Cited
US2716736A
Cited
FR1043309A
Cited
US2700703A
Cited
US2886790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |