US2784468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification of black foundry waste waters
Assignee: Wyeth Holdings LLC
•
Filing: 1952-03-11
•
Granted: 1957-03-12
•
Expires: 1972-03-11
Abstract
No abstract record available.
Inventors
- 👤 Robert B Booth
- 👤 John M Dobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:54
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/18; B22C5/185; C; C02; C02F; C02F1/00; C02F1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A METHOD OF FOUNDRY OPERATION WHICH COMPRISES CASTING METAL IN A SAND MOLD, WHEREBY THE ORGANIC BINDER PRESENT IN SAID MOLD IS PYROLIZED AND CARBONIZED; FREEING THE CARBONIZED ORGANIC MATTER, FINELY HYDRAULIC PROCESS, OTHER IMPURITIES FROM SAID IMPURITIES IN WATER IS OBWHEREBY A SUSPENSION OF SAID IMPURITIES IN WATER IS OBTAINED; THE STEPS WHICH COMPRISE SETTLING SAID WATER SUSPENSION; AND SUBJECTING THE SETTLED WATER SUSPENSION TO FORTH FLOTATION IN THE PRESENCE OF A WATER-DISPERSIBLE ANIONIC PROMOTER HAVING THE FORMULA RX IN WHICH R IS A CARBOXYLIC ACID RADICAL THE MOLECULAR WEIGHT OF WHICH IS GREATER THAN 172, AND X IS HYDROGEN OR AN ALKALI METAL, AND IN THE ABSENCE OF AN ADDED REAGENT CAPABLE OF ACTIVATING SILICA, TO PRODUCE A FLOTATION CONCENTRATION RICH IN SAID IMPURITIES AND A WATER TAILING SUBSTANTIALLY FREE THEREOF.
Claim 2
Dependent Claim
134 words
IN A METHOD OF FOUNDRY OPERATION WHICH COMPRISES CASTING METAL IN A SAND MOLD, WHEREBY THE ORGANIC BINDER PRESENT IN SAID MOLD IS PYROLIZED AND CARBONIZED; FREEING THE CARBONIZED ORGANIC MATTER, FINELY HYDRAULIC PROCESS, OTHER IMPURITIES FROM SAID IMPURITIES IN WATER IS OBWHEREBY A SUSPENSION OF SAID IMPURITIES IN WATER IS OBTAINED; THE STEPS WHICH COMPRISE SETTLING SAID WATER SUSPENSION; AND SUBJECTING THE SETTLED WATER SUSPENSION TO FORTH FLOTATION IN THE PRESENCE OF A WATER-DISPERSIBLE ANIONIC PROMOTER HAVING THE FORMULA RX IN WHICH R IS A CARBOXYLIC ACID RADICAL THE MOLECULAR WEIGHT OF WHICH IS GREATER THAN 172, AND X IS HYDROGEN OR AN ALKALI METAL, AND IN THE ABSENCE OF AN ADDED REAGENT CAPABLE OF ACTIVATING SILICA, TO PRODUCE A FLOTATION CONCENTRATION RICH IN SAID IMPURITIES AND A WATER TAILING SUBSTANTIALLY FREE THEREOF.
References Cited (Backward Citations)
US1388868A
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US1861428A
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US2222728A
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US2259420A
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US2261947A
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US2383045A
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US2416909A
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US2420392A
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US2424552A
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US2480748A
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US2466671A
Cited
US2607486A
Cited
US2553905A
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US2607199A
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 |