Patent US2861687A successfully refreshed from Google Patents.
US2861687A
Expired / Lapsed
US
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Flotation of heavy metal oxides
Assignee: Southwestern Engineering Co
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Filing: 1955-09-09
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Granted: 1958-11-25
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Expires: 1975-09-09
Abstract
No abstract record available.
Inventors
- 👤 Lord Joseph Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:26
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/002; B03D1/006; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
IN CONCENTRATING BY A FLOTATION PROCESS AN ORE WHICH IS AN OXIDE ORE OF A HEAVY METAL OF THE GROUP CONSISTING OF TITANIUM, IRON, MANGANESE, CHROMIUM, TIN AND URANIUM, WHEREIN SAID ORE IS FORMED INTO A PULP AND SUBJECTED TO A FLOTATION STEP, THE STEP OF INCORPORATING INTO THE PULP AN ORGANIC ACID COLLECTOR SELECTED FROM THE GROUP CONSISTING OF FATTY ACIDS HAVING AT LEAST 12 CARBON ATOMS AND NAPHTHENIC ACIDS AND THEIR CORRESPONDING WATER SOLUBLE SALTS, A WATER SOLUBLE SALT OF A HEAVY METAL AND A HYDROCARBON OIL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |