US3681010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ultrafine mixed metallic-oxide powders
Assignee: United States Department of the Army
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Filing: 1970-09-14
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Granted: 1972-08-01
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Expires: 1990-09-14
Abstract
Abstract A METHOD FOR THE PREPARATION OF ULTRAFINE MIXED METALLIC-OXIDE POWDERS COMPRISING THE STEPS OF: COMELTING STOICHIOMETRIC AMOUNTS OF HYDRATED NITRATES OF A LEAST TWO CATIONS, FREEZING THE MELT TO PRODUCE AN INTIMATE MIXTURE OF THE SOLID HYDRATED NITRATES, PARTIALLY DEHYDRATING THE SOLID MIXTURE AT A SUBLIQUIDUS TEMPERATURES AND HEATING THE DEHYDRATED MIXTURE IN ORDER TO DRIVE OFF THE NITROGEN AND DECOMPOSE THE MIXTURE TO THE OXIDE.
Inventors
- 👤 Donald R Messier
- 👤 George E Gazza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
B; B82; B82Y; B82Y30/00; B01; B01J; B01J2/00; C; C01; C01B; C01B13/00; C01B13/14; C01B13/18; C01B13/185; C01F; C01F17/00; C01F17/30; C01F17/32; C01F17/34; C01F7/00; C01F7/02; C01F7/04; C01F7/043; C01F7/16; C01F7/162; C01F7/30; C01F7/32; C01G; C01G49/00; C01G49/0018; C01G49/0054; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2004/00; C01P2004/60; C01P2004/64
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |