Patent US2945216A successfully refreshed from Google Patents.
US2945216A
Expired / Lapsed
US
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Internal shield for electromagnetic head
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1958-01-13
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Granted: 1960-07-12
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Expires: 1978-01-13
Abstract
No abstract record available.
Inventors
- 👤 Cecil E Gyger
- 👤 Alfred D Scarbrough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/10; G11B5/11; G11B5/115; G11B5/29
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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |