Patent US2536058A successfully refreshed from Google Patents.
US2536058A
Expired / Lapsed
US
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Method of treating glass sands
Assignee: Minerals Separation North American Corp
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Filing: 1949-07-13
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Granted: 1951-01-02
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Expires: 1969-07-13
Abstract
No abstract record available.
Inventors
- 👤 Wesley M Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:15
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE PROCESS OF TREATING WASHED AND SCREENED GLASS SANDS WHICH CONSISTS IN CONDITIONING AN AQUEOUS PULP OF SUCH SANDS WITH COOPERATING AGENTS CONSISTING OF A SUBSTANTIALLY INSOLUBLE AND UNSAPONIFICALB OIL, A FATTY ACID HAVING A HYDROCARBON RADICAL OF AT LEAST 12 CARBON ATOMS, AN ALKALI, AND FROTHING AGENT; SUBJECTING SAID CONDITIONED PULP TO FROTH-FLOTATION TREATMENT THEREBY PRODUCING A FROTH-PRODUCT RICH IN IRON IMPURITIES AND A RESIDUE WHICH IS A PURIFIED GLASS SAND COMMANDING A PREMIUM PRICE; AND THEN CONDITIONING SAID FERRUGINOUS FROTH-PRODUCT IN AN AQUEOUS PULP WITH A MINERAL ACID AND SUBJECTING THAT ACID-TREATED PULP TO FROTH-FLOTATION TREATMENT, THEREBY PRODUCING A FROTH-PRODUCT RICH IN IRON MINERALS WHICH IS DISCARDED AND A RESIDUE WHICH IS SUFFICIENTLY POOR IN IRON MINERALS TO BE SOLD AS A WASHED AND SCREENED GLASS SAND.
Claim 2
Dependent Claim
129 words
THE PROCESS OF TREATING WASHED AND SCREENED GLASS SANDS WHICH CONSISTS IN CONDITIONING AN AQUEOUS PULP OF SUCH SANDS WITH COOPERATING AGENTS CONSISTING OF A SUBSTANTIALLY INSOLUBLE AND UNSAPONIFICALB OIL, A FATTY ACID HAVING A HYDROCARBON RADICAL OF AT LEAST 12 CARBON ATOMS, AN ALKALI, AND FROTHING AGENT; SUBJECTING SAID CONDITIONED PULP TO FROTH-FLOTATION TREATMENT THEREBY PRODUCING A FROTH-PRODUCT RICH IN IRON IMPURITIES AND A RESIDUE WHICH IS A PURIFIED GLASS SAND COMMANDING A PREMIUM PRICE; AND THEN CONDITIONING SAID FERRUGINOUS FROTH-PRODUCT IN AN AQUEOUS PULP WITH A MINERAL ACID AND SUBJECTING THAT ACID-TREATED PULP TO FROTH-FLOTATION TREATMENT, THEREBY PRODUCING A FROTH-PRODUCT RICH IN IRON MINERALS WHICH IS DISCARDED AND A RESIDUE WHICH IS SUFFICIENTLY POOR IN IRON MINERALS TO BE SOLD AS A WASHED AND SCREENED GLASS SAND.
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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |