US2690260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation process
Assignee: Distillers Co Yeast Ltd
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Filing: 1952-10-02
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Granted: 1954-09-28
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Expires: 1972-10-02
Abstract
No abstract record available.
Inventors
- 👤 Hall Reginald Harold
- 👤 Jacobs David Ian Hutchingson
- 👤 Jacquet Maurice Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:20
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/025; B03D2203/04; B03D2203/08; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A METHOD OF EFFECTING THE CONCENTRATION OF MINERALS BY FLOTATION, THE STEPS OF ADDING THE THE MINERAL PULP, IN THE CAPACITY OF A FROTHING AGENT, A DIESTER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL AND SUBSTITUTED LOWER ALKYL DIESTERS OF AN ALKANE DICARBOXYLIC ACID IN WHICH THE CARBOXYL GROUPS ARE SEPARATED BY A STRAIGHT CHAIN OF AT LEAST THREE CARBON ATOMS, "LOWER ALKYL" SIGNIFYING ALKYL CONTAINING FROM ONE TO FOUR CARBON ATOMS, AND SUBJECTING THE RESULTANT MIXTURE TO A FLOTATION OPERATION.
Claim 2
Dependent Claim
83 words
IN A METHOD OF EFFECTING THE CONCENTRATION OF MINERALS BY FLOTATION, THE STEPS OF ADDING THE THE MINERAL PULP, IN THE CAPACITY OF A FROTHING AGENT, A DIESTER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL AND SUBSTITUTED LOWER ALKYL DIESTERS OF AN ALKANE DICARBOXYLIC ACID IN WHICH THE CARBOXYL GROUPS ARE SEPARATED BY A STRAIGHT CHAIN OF AT LEAST THREE CARBON ATOMS, "LOWER ALKYL" SIGNIFYING ALKYL CONTAINING FROM ONE TO FOUR CARBON ATOMS, AND SUBJECTING THE RESULTANT MIXTURE TO A FLOTATION OPERATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |