Patent US2721115A successfully refreshed from Google Patents.
US2721115A
Expired / Lapsed
US
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Process of recovering zirconium oxide in the form of cubic crystals
Assignee: Zirconium Corp of America
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Filing: 1951-09-19
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Granted: 1955-10-18
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Expires: 1971-09-19
Abstract
No abstract record available.
Inventors
- 👤 Robert A Schoenlaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:24
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS OF RECOVERING ZIRCONIUM OXIDE IN THE FORM OF CUBIC CRYSTALS STABILIZED BY THE PRESENCE THEREIN OF FROM 4% TO 8% CAO IN SOLID SOLUTION WHICH COMPRISES: (A) MIXING ABOUT 100 PARTS OF ZIRCON AND ABOUT 100 PARTS DOLOMITE, (B) FORMING AN INCOMPLETELY-FUSED CLINKER FROM SUCH ADMIXTURE BY HEATING SAME TO A TEMPERATURE OF FROM 2400* F. TO 2600* F.; WHEREBY SAID ZIRCONIUM OXIDE CRYSTALS ARE FORMED AND THE CAO CONTENT THEREOF IS FORMED FROM SAID DOLOMITE, (C) COOLING SAID CLINKER; (D) COMMINUTING SAID CLINKER; AND (E) SEPARATING FROM SAID COMMINUTED MASS CRYSTALS OF SAID STABLIIZED ZIRCONIUM OXIDE.
Claim 2
Dependent Claim
99 words
A PROCESS OF RECOVERING ZIRCONIUM OXIDE IN THE FORM OF CUBIC CRYSTALS STABILIZED BY THE PRESENCE THEREIN OF FROM 4% TO 8% CAO IN SOLID SOLUTION WHICH COMPRISES: (A) MIXING ABOUT 100 PARTS OF ZIRCON AND ABOUT 100 PARTS DOLOMITE, (B) FORMING AN INCOMPLETELY-FUSED CLINKER FROM SUCH ADMIXTURE BY HEATING SAME TO A TEMPERATURE OF FROM 2400* F. TO 2600* F.; WHEREBY SAID ZIRCONIUM OXIDE CRYSTALS ARE FORMED AND THE CAO CONTENT THEREOF IS FORMED FROM SAID DOLOMITE, (C) COOLING SAID CLINKER; (D) COMMINUTING SAID CLINKER; AND (E) SEPARATING FROM SAID COMMINUTED MASS CRYSTALS OF SAID STABLIIZED ZIRCONIUM OXIDE.
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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |