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US2424351A
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US
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Process for the treatment of marmatitic zinc ores with hci
Assignee: Combined Metals Reduction Co
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Filing: 1944-05-01
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Granted: 1947-07-22
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Expires: 1964-05-01
Abstract
No abstract record available.
Inventors
- 👤 Niels C Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
C; C22; C22B; C22B3/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US587128A
Cited
GB189523543A
Cited
US1463483A
Cited
US1501873A
Cited
US1620873A
Cited
US1572268A
Cited
US1639610A
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US2363572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-21 | 1951-01-20 | 1951-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-21 | 1955-01-20 | 1955-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-21 | 1959-01-20 | 1959-07-22 | $7700.00 | Window Closed / Lapsed |