Patent US1608844A successfully refreshed from Google Patents.
US1608844A
Expired / Lapsed
US
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Treament of oxidized ores or other oxidized compounds of copper and zinc
Assignee: Individual
•
Filing: 1923-11-10
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Granted: 1926-11-30
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Expires: 1943-11-10
Abstract
No abstract record available.
Inventors
- 👤 Edwards George Waldron
- 👤 Durant Henry Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:06
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/12; C22B3/14; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1929-11-29 | 1930-05-31 | 1930-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-11-29 | 1934-05-31 | 1934-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-11-29 | 1938-05-31 | 1938-11-30 | $7700.00 | Window Closed / Lapsed |