US2657800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frothing agents for the flotation of ores
Assignee: Distillers Co Yeast Ltd
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Filing: 1951-06-25
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Granted: 1953-11-03
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Expires: 1971-06-25
Abstract
No abstract record available.
Inventors
- 👤 Hall Reginald Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/04; B03D2203/00; B03D2203/02; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
IN A METHOD OF EFFECTING THE CONCENTRATION OF MINERALS BY FLOTATION, THE STEPS OF ADDING TO THE MINERAL PULP, IN THE CAPACITY OF A FROTHING AGENT, A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKOXY ESTER COMPOUNDS OF THE FORMULA:
References Cited (Backward Citations)
US2361456A
Cited
US2561251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |