US3000703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of zirconium oxide
Assignee: Evonik Operations GmbH
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Filing: 1957-11-05
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Granted: 1961-09-19
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Expires: 1977-11-05
Abstract
No abstract record available.
Inventors
- 👤 Brugger Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:43
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR THE PRODUCTION OF ZIRCONIUM OXIDE WHICH COMPRISES: (A) INTRODUCING SOLID ZIRCONIUM TETRACHLORIDE INTO A REREACTION ZONE, (B) SIMULTANEOUSLY INTRODUCING INTO THE REACTION ZONE A HYDROLYZING AGENT, (C) SAID HYDROLYZING AGENT HAVING THE FORMULA ROH WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL RADICALS CONTAINING BETWEEN ONE AND FIVE CARBON ATOMS, (D) MAINTAINING THE TEMPERATURE IN THE REACTION ZONE ABOVE THE BOILING POINT OF THE HYDROLYZING AGENT BUT BELOW THE SUBLIMATION POINT OF THE ZIRCONIUM TETRACHLORIDE, (E) MAINTAINING THE SAID REACTANTS IN THE REACTION ZONE FOR FROM ABO UT 1-5 HOURS IN ORDER TO SUBSTANTIALLY ELIMINATE THE CHLORIDE FROM THE RESULTING ZIRCONIUM OXIDE PRODUCT, AND (F) THEREAFTER CALCINING THE RESULTING PRODUCT TO CONVERT HYDROUS ZIRCONIA TO ZIRCONIUM OXIDE.
Claim 2
Dependent Claim
124 words
A PROCESS FOR THE PRODUCTION OF ZIRCONIUM OXIDE WHICH COMPRISES: (A) INTRODUCING SOLID ZIRCONIUM TETRACHLORIDE INTO A REREACTION ZONE, (B) SIMULTANEOUSLY INTRODUCING INTO THE REACTION ZONE A HYDROLYZING AGENT, (C) SAID HYDROLYZING AGENT HAVING THE FORMULA ROH WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL RADICALS CONTAINING BETWEEN ONE AND FIVE CARBON ATOMS, (D) MAINTAINING THE TEMPERATURE IN THE REACTION ZONE ABOVE THE BOILING POINT OF THE HYDROLYZING AGENT BUT BELOW THE SUBLIMATION POINT OF THE ZIRCONIUM TETRACHLORIDE, (E) MAINTAINING THE SAID REACTANTS IN THE REACTION ZONE FOR FROM ABO UT 1-5 HOURS IN ORDER TO SUBSTANTIALLY ELIMINATE THE CHLORIDE FROM THE RESULTING ZIRCONIUM OXIDE PRODUCT, AND (F) THEREAFTER CALCINING THE RESULTING PRODUCT TO CONVERT HYDROUS ZIRCONIA TO ZIRCONIUM OXIDE.
References Cited (Backward Citations)
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Cited
US1308577A
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GB307881A
Cited
US2670275A
Cited
US2635946A
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FR1040886A
Cited
US2791490A
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FR1094146A
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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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |