Patent US2694490A successfully refreshed from Google Patents.
US2694490A
Expired / Lapsed
US
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Method and apparatus for hydraulically classifying coal of very small sizes
Assignee: Link Belt Co
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Filing: 1950-11-07
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Granted: 1954-11-16
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Expires: 1970-11-07
Abstract
No abstract record available.
Inventors
- 👤 Harvengt Edmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:45
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2104090A
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US1100904A
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US1508176A
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GB221928A
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US1544999A
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US1845602A
Cited
US1696767A
Cited
US1912077A
Cited
US1789516A
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US2122039A
Cited
US2194139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |