Patent US3497658A successfully refreshed from Google Patents.
US3497658A
Expired / Lapsed
US
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Method and apparatus for induction heating of slabs
Assignee: Park Ohio Holdings Corp
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Filing: 1968-03-20
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Granted: 1970-02-24
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Expires: 1988-03-20
Abstract
No abstract record available.
Inventors
- 👤 Nicholas V Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2748240A
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US2736788A
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US2720577A
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US2838641A
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US2875995A
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US2849584A
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US2978237A
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US3120596A
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US3279774A
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US3291954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |