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Patent US3053920A successfully refreshed from Google Patents.
US3053920A
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US
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Control for electric furnace
Assignee: Park Ohio Holdings Corp
•
Filing: 1959-06-29
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Granted: 1962-09-11
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Expires: 1979-06-29
Abstract
No abstract record available.
Inventors
- 👤 James P Seitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:58
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/16; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1378019A
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US1521017A
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US1638857A
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US1833617A
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US1849309A
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US1931644A
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US1845910A
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US2220769A
Cited
US2546725A
Cited
US2977398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |