Patent US2784841A successfully refreshed from Google Patents.
US2784841A
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US
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Hydraulic classification of solids
Assignee: American Agricultural Chemical Co
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Filing: 1953-04-13
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Granted: 1957-03-12
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Robert D Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:56
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/62; B03B5/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL9883C
Cited
GB190921668A
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US1264688A
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US1959212A
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US2019968A
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US2360129A
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US2442522A
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US2425551A
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US2708517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |