US2488201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of lead and zinc from copper ammonium salt solutions
Assignee: CALUMET AND HECLA CONS COPPER
•
Filing: 1946-08-23
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Granted: 1949-11-15
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Expires: 1966-08-23
Abstract
No abstract record available.
Inventors
- 👤 Herman C Kenny
- 👤 Lawrence C Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:24
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/14; C22; C22B; C22B15/00; C22B15/0063; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |