Patent US3472649A successfully refreshed from Google Patents.
US3472649A
Expired / Lapsed
US
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Electric-arc steelmaking
Assignee: Steel Company of Canada Ltd
•
Filing: 1967-07-10
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Granted: 1969-10-14
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Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Jaroslaw George Sibakin
- 👤 Gordon A Roeder
- 👤 Paul H H Hookings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:34
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/5211; C21C5/527; F; F27; F27B; F27B3/00; F27B3/08; F27B3/085; F27D; F27D11/00; F27D11/08; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1535311A
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US1902638A
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US2502259A
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US2704248A
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US2805930A
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US3153588A
Cited
US3188197A
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 |