US3193346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing zirconium oxides
Assignee: PPG Industries Inc
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Filing: 1962-03-06
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Granted: 1965-07-06
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Expires: 1982-03-06
Abstract
No abstract record available.
Inventors
- 👤 Irvin C Klimaszewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:22
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN THE PROCESS OF PREPARING ZIRCONIUM OXIDE FROM A SOLUTION OF ZIRCONYL NITRATE AND NITRIC ACID WHEREIN THE SOLUTION IS CONCENTRATED IN AN EVAPORATOR TO PRECIPITATE SOME SOLID ZIRCONYL NITRATE AND CALCINATION OF THE SOLID ZIRCONYL NITRATE TO ZIRCONIUM OXIDE THE IMPROVEMENT WHICH COMPRISES RECOVERY FINELY-POWDERED ZIRCONIUM OXIDE RESULTING FROM THE CALCINING STEP AND RECYCLING SAID FINELYPOWDERED ZIRCONIUM OXIDE SO RECOVERED TO THE FILTRATION STEP.
Claim 2
Dependent Claim
65 words
IN THE PROCESS OF PREPARING ZIRCONIUM OXIDE FROM A SOLUTION OF ZIRCONYL NITRATE AND NITRIC ACID WHEREIN THE SOLUTION IS CONCENTRATED IN AN EVAPORATOR TO PRECIPITATE SOME SOLID ZIRCONYL NITRATE AND CALCINATION OF THE SOLID ZIRCONYL NITRATE TO ZIRCONIUM OXIDE THE IMPROVEMENT WHICH COMPRISES RECOVERY FINELY-POWDERED ZIRCONIUM OXIDE RESULTING FROM THE CALCINING STEP AND RECYCLING SAID FINELYPOWDERED ZIRCONIUM OXIDE SO RECOVERED TO THE FILTRATION STEP.
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) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |