Patent US2761890A successfully refreshed from Google Patents.
US2761890A
Expired / Lapsed
US
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Method and arrangement in the heating of electric furnaces
Assignee: Compagnie de Saint Gobain SA
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Filing: 1953-03-16
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Granted: 1956-09-04
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Expires: 1973-03-16
Abstract
No abstract record available.
Inventors
- 👤 Burthe Pierre H C La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:17
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1997524A
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US2089690A
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US2277679A
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US2636913A
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US2545619A
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US2413037A
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US2397852A
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US2490339A
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US2600490A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |