Patent US2620433A successfully refreshed from Google Patents.
US2620433A
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US
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Coil for differential heat-treatment
Assignee: Ohio Crankshaft Co
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Filing: 1947-10-28
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Granted: 1952-12-02
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Expires: 1967-10-28
Abstract
No abstract record available.
Inventors
- 👤 Francis S Denneen
- 👤 William C Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:40
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1412484A
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US1687656A
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GB472310A
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GB480380A
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US2238082A
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US2268527A
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US2268528A
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US2280064A
Cited
US2259324A
Cited
US2303408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |