Patent US2934428A successfully refreshed from Google Patents.
US2934428A
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US
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Method for treating nickel sulphide ore concentrates
Assignee: QUEBEC METALLURG IND Ltd
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Filing: 1957-05-08
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Granted: 1960-04-26
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Expires: 1977-05-08
Abstract
No abstract record available.
Inventors
- 👤 Donaldson John William
- 👤 Jr Howard Franklin Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:08
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/02; C22B23/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21335E
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US841721A
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US1266775A
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US1729423A
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US1756092A
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US2239626A
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US2424866A
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US2609272A
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US2746859A
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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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |