Patent US1931944A successfully refreshed from Google Patents.
US1931944A
Expired / Lapsed
US
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Extraction of tin from ores
Assignee: Individual
•
Filing: 1932-08-08
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Granted: 1933-10-24
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Expires: 1952-08-08
Abstract
No abstract record available.
Inventors
- 👤 Wood Louis Albert
- 👤 Sulman Henry Livingstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:07
CPC Classifications
C; C22; C22B; C22B25/00; C22B25/02
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) | 1936-10-23 | 1937-04-24 | 1937-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-23 | 1941-04-24 | 1941-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-23 | 1945-04-24 | 1945-10-24 | $7700.00 | Window Closed / Lapsed |