Patent US3119661A successfully refreshed from Google Patents.
US3119661A
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Method for recovery of sio2 and zro2 from zircon
Assignee: Millennium Petrochemicals Inc
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Filing: 1959-06-18
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Granted: 1964-01-28
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Expires: 1979-06-18
Abstract
No abstract record available.
Inventors
- 👤 Edgel P Stambaugh
- 👤 Raymond A Foos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:57
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A METHOD FOR RECOVERING PURIFIED SILICON DIOXIDE AND ZIRCONIUM DIOXIDE FROM ZIRCON SAND WHICH COMPRISES FUSING ZIRCON SAND WITH CAUSTIC, LEACHING THE RESULTING ZIRCON FRIT WITH WATER TO REMOVE SOLUBLE SODIUM SILICATES AND DISSOLVING THE WATER LEACHED ZIRCON FRIT IN A MINERAL ACID, THE IMPROVEMENT WHICH COMPRISES HEATING SAID MINERAL ACID SOLUTION, HAVING AN ACID CONCENTRATION WITHIN THE RANGE OF ABOUT 75 TO 200 GRAMS PER LITER, CONTAINING ABOUT 20 TO 180 GRAMS PER LITER OF ZIRCONIUM DIOXIDE AND UP TO 30 GRAMS PER LITER OF SILICON DIOXIDE TOGETHER WITH OTHER METALLIC IMPURITIES, AT A TEMPERATURE OF ABOUT 165* TO ABOUT 175*C. AND UNDER A PRESSURE OF ABOUT 30 TO
Claim 2
Dependent Claim
111 words
IN A METHOD FOR RECOVERING PURIFIED SILICON DIOXIDE AND ZIRCONIUM DIOXIDE FROM ZIRCON SAND WHICH COMPRISES FUSING ZIRCON SAND WITH CAUSTIC, LEACHING THE RESULTING ZIRCON FRIT WITH WATER TO REMOVE SOLUBLE SODIUM SILICATES AND DISSOLVING THE WATER LEACHED ZIRCON FRIT IN A MINERAL ACID, THE IMPROVEMENT WHICH COMPRISES HEATING SAID MINERAL ACID SOLUTION, HAVING AN ACID CONCENTRATION WITHIN THE RANGE OF ABOUT 75 TO 200 GRAMS PER LITER, CONTAINING ABOUT 20 TO 180 GRAMS PER LITER OF ZIRCONIUM DIOXIDE AND UP TO 30 GRAMS PER LITER OF SILICON DIOXIDE TOGETHER WITH OTHER METALLIC IMPURITIES, AT A TEMPERATURE OF ABOUT 165* TO ABOUT 175*C. AND UNDER A PRESSURE OF ABOUT 30 TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |