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US3472992A
Expired / Lapsed
US
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Crossfield inductor for inductively heating workpieces of varying cross section
Assignee: SMS Elotherm GmbH
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Filing: 1968-02-12
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Granted: 1969-10-14
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Expires: 1988-02-12
Abstract
No abstract record available.
Inventors
- 👤 Herbert Geisel
- 👤 Leonhard Springob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:49
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1821530A
Cited
US3251976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |