Patent US3245757A successfully refreshed from Google Patents.
US3245757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing zirconium oxide
Assignee: PPG Industries Inc
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Filing: 1962-03-06
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Granted: 1966-04-12
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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
2026-10-31 20:39
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A METHOD OF PREPARING AN OXIDE OF A METAL OF THE GROUP CONSISTING OF ZIRCONIUM AND HAFNIUM HAVING A BULK DENSITY OF AT LEAST 40 POUNDS PER CUBIC FOOT WHICH COMPRISES HEATING A SLURRY OF A SOLID NITRATE OF SAID GROUP FOR A PERIOD OF AT LEAST 10 HOURS AND AT A TEMPERATURE OF AT LEAST 125*F., MAINTAINING ENOUGH WATER IN THE SLURRY TO HOLD THE RESULTING SOLIDS IN SLURRY FORM DURING THE HEATING, SEPARATING WATER FROM THE SLURRY AND THEREBY FORMING A THIXOTROPIC MIXTURE OF WATER AND SAID NITRATE, AND CALCINING SAID MIXTURE TO REMOVE NITROGEN OXIDES THEREFROM AND THEREBY TO FORM SAID OXIDE.
Claim 2
Independent Claim
105 words
A METHOD OF PREPARING AN OXIDE OF A METAL OF THE GROUP CONSISTING OF ZIRCONIUM AND HAFNIUM HAVING A BULK DENSITY OF AT LEAST 40 POUNDS PER CUBIC FOOT WHICH COMPRISES HEATING A SLURRY OF A SOLID NITRATE OF SAID GROUP FOR A PERIOD OF AT LEAST 10 HOURS AND AT A TEMPERATURE OF AT LEAST 125*F., MAINTAINING ENOUGH WATER IN THE SLURRY TO HOLD THE RESULTING SOLIDS IN SLURRY FORM DURING THE HEATING, SEPARATING WATER FROM THE SLURRY AND THEREBY FORMING A THIXOTROPIC MIXTURE OF WATER AND SAID NITRATE, AND CALCINING SAID MIXTURE TO REMOVE NITROGEN OXIDES THEREFROM AND THEREBY TO FORM SAID OXIDE.
Claim 3
Independent Claim
90 words
A METHOD OF PREPARING A NITRATE OF ZIRCONIUM CAPABLE OF PRODUCING ZIRCONIUM OXIDE HAVING A BULK DENSITY OF AT LEAST 40 POUNDS PER CUBIC FOOT WHEN CALCINED AT A TEMPERATURE OF 550*F. TO 1500*F. WHICH COMPRISES HEATING AN AQUEOUS SLURRY OF SOLID NITRATE OF ZIRCONIUM AT A TEMPERATURE OF AT LEAST 125*F. FOR A PERIOD OF AT LEAST 10 HOURS WHILE MAINTAINING A SOLIDS CONTENT OF THE SLURRY AT 3 TO 60 PERCENT BY WEIGHT, SEPARATING WATER THEREFROM AND FORMING A THIXOTGROPIC MIXTURE OF WATER AND A NITRATE OF ZIRCONIUM.
Claim 4
Independent Claim
90 words
A METHOD OF PREPARING A NITRATE OF ZIRCONIUM CAPABLE OF PRODUCING ZIRCONIUM OXIDE HAVING A BULK DENSITY OF AT LEAST 40 POUNDS PER CUBIC FOOT WHEN CALCINED AT A TEMPERATURE OF 550*F. TO 1500*F. WHICH COMPRISES HEATING AN AQUEOUS SLURRY OF SOLID NITRATE OF ZIRCONIUM AT A TEMPERATURE OF AT LEAST 125*F. FOR A PERIOD OF AT LEAST 10 HOURS WHILE MAINTAINING A SOLIDS CONTENT OF THE SLURRY AT 3 TO 60 PERCENT BY WEIGHT, SEPARATING WATER THEREFROM AND FORMING A THIXOTGROPIC MIXTURE OF WATER AND A NITRATE OF ZIRCONIUM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |