US2769540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of beneficiating sand
Assignee: Wyeth Holdings LLC
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Filing: 1952-11-08
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Granted: 1956-11-06
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Expires: 1972-11-08
Abstract
No abstract record available.
Inventors
- 👤 Otto R Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:58
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/002; B03D1/008; B03D2201/00; B03D2201/007; B03D2201/02; B03D2201/04; B03D2203/00; B03D2203/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A METHOD OF PREPARING A GLASS SAND APPROACHING A PREDETERMINED ANALYSIS, FROM A RAW MATERIAL EXCESSIVE IN FELDSPAR, DEFICIENT IN QUARTZ AND CONTAINING IRON-CONTAMINATING IMPURITIES, WHICH COMPRISES; SUBJECTING SAID RAW MATERIAL TO ATTRITION SCRUBBING, AND DESLIMING; CONDITIONING IN AN ACID CIRCUIT WITH A PROMOTER AND FROTHER; FLOATING TO PRODUCE A CONCENTRAT RICH IN IRON AND A TAILING SUBSTANTALLY IRON-FREE; EFFECTING THE REMOVAL OF THE FELDSPAR CONTENT FROM A PORTION OF SAID TAILING BY CONDITIONING SAID PORTION WITH HYDROFLUORIC ACID, A FROTHER AND PROMOTER, AND SEPARATING BY FLOTATION SAID CONDITIONED TAILING INTO A FRACTION CONTAINING THE REMOVED FELDSPAR AN A QUARTZ FRACTION; AND INTIMATELY MIXING SAID QUARTZ FRACTION WITH THE REMAINDER OF SAID TAILING TO OBTAIN SAID GLASS SAND; THE PART OF SAID TAILING CONDITIONED BEING SELECTED SO AS TO REMOVE AN AMOUNT OF FELDSPAR EQUAL TO THE EXCESS THEREOF IN THE ORIGINAL MATERIAL, THERE BEING NO
Claim 2
Independent Claim
146 words
A METHOD OF PREPARING A GLASS SAND APPROACHING A PREDETERMINED ANALYSIS, FROM A RAW MATERIAL EXCESSIVE IN FELDSPAR, DEFICIENT IN QUARTZ AND CONTAINING IRON-CONTAMINATING IMPURITIES, WHICH COMPRISES; SUBJECTING SAID RAW MATERIAL TO ATTRITION SCRUBBING, AND DESLIMING; CONDITIONING IN AN ACID CIRCUIT WITH A PROMOTER AND FROTHER; FLOATING TO PRODUCE A CONCENTRAT RICH IN IRON AND A TAILING SUBSTANTALLY IRON-FREE; EFFECTING THE REMOVAL OF THE FELDSPAR CONTENT FROM A PORTION OF SAID TAILING BY CONDITIONING SAID PORTION WITH HYDROFLUORIC ACID, A FROTHER AND PROMOTER, AND SEPARATING BY FLOTATION SAID CONDITIONED TAILING INTO A FRACTION CONTAINING THE REMOVED FELDSPAR AN A QUARTZ FRACTION; AND INTIMATELY MIXING SAID QUARTZ FRACTION WITH THE REMAINDER OF SAID TAILING TO OBTAIN SAID GLASS SAND; THE PART OF SAID TAILING CONDITIONED BEING SELECTED SO AS TO REMOVE AN AMOUNT OF FELDSPAR EQUAL TO THE EXCESS THEREOF IN THE ORIGINAL MATERIAL, THERE BEING NO
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |