Patent US234393A successfully refreshed from Google Patents.
Patent US2738449A successfully refreshed from Google Patents.
US2738449A
Expired / Lapsed
US
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Electromagnet construction
Assignee: Dana Inc
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Filing: 1951-12-12
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Granted: 1956-03-13
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Expires: 1971-12-12
Abstract
No abstract record available.
Inventors
- 👤 James A Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:50
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1638; H01F7/1646; F; F16; F16D; F16D27/00; F16D27/004; H01F7/121; H01F7/122
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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |