Patent US1919947A successfully refreshed from Google Patents.
US1919947A
Expired / Lapsed
US
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Method of recovering metals and metallic oxides
Assignee: Virginia Smelting Co
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Filing: 1929-05-07
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Granted: 1933-07-25
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Expires: 1949-05-07
Abstract
No abstract record available.
Inventors
- 👤 Charles W Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:08
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/06; C22B3/08; C22B19/00; C22B19/20; C22B19/22; 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) | 1936-07-24 | 1937-01-23 | 1937-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-07-24 | 1941-01-23 | 1941-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-07-24 | 1945-01-23 | 1945-07-25 | $7700.00 | Window Closed / Lapsed |