Patent US3518270A successfully refreshed from Google Patents.
US2987183A
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Froth flotation process
Assignee: Hercules Powder Co
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Filing: 1959-02-03
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Granted: 1961-06-06
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Expires: 1979-02-03
Abstract
No abstract record available.
Inventors
- 👤 William T Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:25
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE PROCESS OF CONCENTRATING AN ORE SELECTED FROM THE GROUP CONSISTING OF NONMETALLIC ORES AND OXIDE ORES BY FROTH FLOTATION WHICH COMPRISES INCORPORATING A WATERDISPERSIBLE SAPONIFIED TALL OIL PITCH PREPARED BY REACTING TALL OIL PITCH WITH ALKALI AT TEMPERATURES FROM ABOUT 150* C. TO ABOUT 180*C. AND AT PRESSURES FROM ABOUT 30 LBS./ SQ. IN. TO ABOUT 45 LBS./SQ. IN. IN AN AQUEOUS ORE PULP OF THE INDICATED TYPE, AGITATING THE PULP TO FORM A FROTH, AND SEPARATING THE FROTH FROM THE PULP.
Claim 2
Dependent Claim
83 words
THE PROCESS OF CONCENTRATING AN ORE SELECTED FROM THE GROUP CONSISTING OF NONMETALLIC ORES AND OXIDE ORES BY FROTH FLOTATION WHICH COMPRISES INCORPORATING A WATERDISPERSIBLE SAPONIFIED TALL OIL PITCH PREPARED BY REACTING TALL OIL PITCH WITH ALKALI AT TEMPERATURES FROM ABOUT 150* C. TO ABOUT 180*C. AND AT PRESSURES FROM ABOUT 30 LBS./ SQ. IN. TO ABOUT 45 LBS./SQ. IN. IN AN AQUEOUS ORE PULP OF THE INDICATED TYPE, AGITATING THE PULP TO FORM A FROTH, AND SEPARATING THE FROTH FROM THE PULP.
References Cited (Backward Citations)
US2214716A
Cited
US2483970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |