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US3533778A
Expired / Lapsed
US
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Automatic control of pig iron refining
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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Filing: 1967-04-14
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Granted: 1970-10-13
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Expires: 1987-04-14
Abstract
No abstract record available.
Inventors
- 👤 Paul Emile Nilles
- 👤 Etienne Marie Denis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:56
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2807537A
Cited
US3161499A
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US3181343A
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US3329495A
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US3372023A
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FR1422726A
Cited
US3377158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |