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US2543689A
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Process for the separation of solids of different specific gravity and grain size
Assignee: Directie van de Staatsmijnen in Limburg
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Filing: 1946-04-23
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Granted: 1951-02-27
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Expires: 1966-04-23
Abstract
No abstract record available.
Inventors
- 👤 Krijgsman Centinus
- 👤 Jan N J Leeman
- 👤 Antje G Driessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:24
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/32; B03B5/34; B03B9/00; B03B9/005; B04; B04C; B04C5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1149463A
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US1197946A
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US1392401A
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US1629182A
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US2052004A
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US2104537A
Cited
US2287115A
Cited
US2364799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |