US2437870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating sulfidic tungsten ore concentrates
Assignee: Individual
•
Filing: 1942-09-29
•
Granted: 1948-03-16
•
Expires: 1962-09-29
Abstract
No abstract record available.
Inventors
- 👤 Williams Thomas Jefferson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:26
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1049193A
Cited
US1081566A
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US1277475A
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US1217914A
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US1483567A
Cited
DE425364C
Cited
US1895811A
Cited
US2017557A
Cited
US2238250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |