Patent US3745042A successfully refreshed from Google Patents.
US2591070A
Expired / Lapsed
US
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Combined magnetic transducer head and output transformer
Assignee: Indiana Steel Products Co
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Filing: 1947-04-17
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Granted: 1952-04-01
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Expires: 1967-04-17
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/02; G11B5/027; G11B5/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1640881A
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US1720943A
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US1915804A
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DE612450C
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US2351003A
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US2351011A
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US2418542A
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US2381463A
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US2469444A
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US2456767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |