Patent US2941942A successfully refreshed from Google Patents.
US2941942A
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Method of dewatering foundry sand slimes
Assignee: Eimco Corp
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Filing: 1955-06-14
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Granted: 1960-06-21
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Expires: 1975-06-14
Abstract
No abstract record available.
Inventors
- 👤 Donald A Dahlstrom
- 👤 Robert C Emmett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:20
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/03; B01D21/00; B01D21/0012; B01D21/01; B01D21/02; B01D21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE PROCESS OF DEWATERING SLURRY OF SLIMES FROM A FOUNDRY SAND WASHING OPERATION CONSISTING OF THE STEPS: INOCULATING THE SLURRY WITH A POLYELECTROLYTE CLARIFYING THE FLOCCULATED SLURRY, INOCULATING THE THICKENED SLUDGE AFTER SETTLEMENT WITH HYDRATED LIME, AND THEN FILTERING THE SLUDGE.
Claim 2
Dependent Claim
41 words
THE PROCESS OF DEWATERING SLURRY OF SLIMES FROM A FOUNDRY SAND WASHING OPERATION CONSISTING OF THE STEPS: INOCULATING THE SLURRY WITH A POLYELECTROLYTE CLARIFYING THE FLOCCULATED SLURRY, INOCULATING THE THICKENED SLUDGE AFTER SETTLEMENT WITH HYDRATED LIME, AND THEN FILTERING THE SLUDGE.
References Cited (Backward Citations)
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US2287861A
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Cited
US2862880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |