Patent US3312631A successfully refreshed from Google Patents.
US3312631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making metal oxide microspheres
Assignee: WR Grace and Co
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Filing: 1965-04-15
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Granted: 1967-04-04
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Expires: 1985-04-15
Abstract
No abstract record available.
Inventors
- 👤 Jean G Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:20
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; C; C01; C01F; C01F15/00; C01G; C01G25/00; C01G25/02; C01G43/00; C01G43/01; C01G43/025; C01G56/00; C01G56/004; C01G56/005; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS FOR FORMING MICROSPHERES FROM METAL OXIDES COMPRISING THE STEPS OF (A) MIXING AN AMMONIA-RELEASING AGENT WITH AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 1 G./1., EXPRESSED AS THE METAL OXIDE, UP TO SATURATION QUANTITIES OF SALTS OF METAL CATIONS SELECTED FROM THE GROUP CONSISTING OF U+4 (UO2)+2, TH+4, PU+4, (PUO2)+2 (ZRO)+2, BE+2, Y+3, AND MIXTURES THEREOF, AND CONTAINING FROM 0 TO 5 MOLES OF COLLOIDAL CARBON PER MOLE OF METAL, THE QUANTITY OF AMMONIA-RELEASING AGENT MIXED WITH THE SOLUTION BEING SUFFICIENT TO PROVIDE AT LEAST 70% OF THE STOIOCHIOMETRIC QUANTITY OF AMMONIA REQUIRED TO REACT WITH THE SALTS IN THE SOLUTION; (B) INTRODUCING THE MIXTURE IN THE FORM OF DROPLETS IN A DEHYDRATING SOLVENT HAVING A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE SUBSTANTIAL DECOMPOSITION OF THE AMMONIA-RELEASING AGENT, AND (C) RECOVERING DEHYDRATED MICROSPHERES FROM THE DEHYDRATING SOLVENT.
Claim 2
Dependent Claim
137 words
A PROCESS FOR FORMING MICROSPHERES FROM METAL OXIDES COMPRISING THE STEPS OF (A) MIXING AN AMMONIA-RELEASING AGENT WITH AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 1 G./1., EXPRESSED AS THE METAL OXIDE, UP TO SATURATION QUANTITIES OF SALTS OF METAL CATIONS SELECTED FROM THE GROUP CONSISTING OF U+4 (UO2)+2, TH+4, PU+4, (PUO2)+2 (ZRO)+2, BE+2, Y+3, AND MIXTURES THEREOF, AND CONTAINING FROM 0 TO 5 MOLES OF COLLOIDAL CARBON PER MOLE OF METAL, THE QUANTITY OF AMMONIA-RELEASING AGENT MIXED WITH THE SOLUTION BEING SUFFICIENT TO PROVIDE AT LEAST 70% OF THE STOIOCHIOMETRIC QUANTITY OF AMMONIA REQUIRED TO REACT WITH THE SALTS IN THE SOLUTION; (B) INTRODUCING THE MIXTURE IN THE FORM OF DROPLETS IN A DEHYDRATING SOLVENT HAVING A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE SUBSTANTIAL DECOMPOSITION OF THE AMMONIA-RELEASING AGENT, AND (C) RECOVERING DEHYDRATED MICROSPHERES FROM THE DEHYDRATING SOLVENT.
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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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |