Patent US2107289A successfully refreshed from Google Patents.
US2107289A
Expired / Lapsed
US
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Concentration of minerals
Assignee: Mining Process and Patent Co
•
Filing: 1934-10-29
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Granted: 1938-02-08
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Expires: 1954-10-29
Abstract
No abstract record available.
Inventors
- 👤 John J Denny
- 👤 Arthur C Daman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:44
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/08; B03D1/087; B03D1/1412; B03D1/1443; B03D1/1462; B03D1/1493
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) | 1941-02-07 | 1941-08-09 | 1942-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-02-07 | 1945-08-09 | 1946-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-02-07 | 1949-08-09 | 1950-02-08 | $7700.00 | Window Closed / Lapsed |