US2835387A
Expired / Lapsed
US
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Centrifugal method and means for continuously fractionating solid particles in liquid suspension thereof
Assignee: Stamicarbon BV
•
Filing: 1949-03-11
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Granted: 1958-05-20
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Expires: 1969-03-11
Abstract
No abstract record available.
Inventors
- 👤 Freerk J Fontein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:14
CPC Classifications
B; B04; B04C; B04C9/00; B01; B01D; B01D21/00; B01D21/24; B01D21/245; B01D21/2488; B01D21/26; B01D21/267; B01D21/30; B01D21/34; B04C5/00; B04C5/12; B04C5/14; B04C5/185; B04C2009/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1149463A
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US1197946A
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US2312706A
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US2377524A
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US2377721A
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CH238137A
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US2422203A
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GB563408A
Cited
US2550340A
Cited
US2533655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |