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US2435340A
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Process for the treatment of marmatitic zinc ores
Assignee: Combined Metals Reduction Co
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Filing: 1944-05-01
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Granted: 1948-02-03
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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
2026-10-29 20:26
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/20; C22B19/26; C22B19/22; C22B3/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US203849A
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US880775A
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US914649A
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US1779841A
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US2007233A
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US1937633A
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US2001409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-02 | 1951-08-04 | 1952-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-02 | 1955-08-04 | 1956-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-02 | 1959-08-04 | 1960-02-03 | $7700.00 | Window Closed / Lapsed |