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US2623637A
Expired / Lapsed
US
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System of separation
Assignee: MIJ VOOR KOLENBEWERING STAMICA
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Filing: 1949-08-17
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Granted: 1952-12-30
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Expires: 1969-08-17
Abstract
No abstract record available.
Inventors
- 👤 Freerk J Fontein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:26
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2135957A
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US2190637A
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US2206980A
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US2373635A
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US2387866A
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US2497790A
Cited
US2496590A
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US2490365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |