US3055736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing aluminum oxide
Assignee: Pechiney SA
•
Filing: 1959-07-15
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Granted: 1962-09-25
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Expires: 1979-07-15
Abstract
No abstract record available.
Inventors
- 👤 Becue Colette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:16
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/428; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C01P; C01P2002/00; C01P2002/02; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
PROCESS FOR PRODUCING PURE DISPERSED AMORPHOUS ALUMINUM OXIDE BY DISSOLVING AT A TEMPERATURE ABOVE 200* C. IN A NON-OXIDIZING ATMOSPHERE A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM AND ALLOYS THEREOF OTHER THAN ALKALINE AND ALKALINE EARTH METAL ALLOYS IN ONE OF THE MATERIALS OF THE GROUP CONSISTING OF MERCURY, ALLOYS OF MERCURY AND GALLIUM TO YIELD A CONCENTRATION OF SUBSTANCE WITHIN THE RANGE OF 0.01 AND 4% BY WEIGHT; SPREADING SAID SOLUTION INTO A THIN LAYER AND COOLING THE SOLUTION TO A TEMPERATURE BELOW 120* C., WHEREBY THE ALUMINUM SEPARATES THEREFROM IN THE FORM OF MICROCRYSTALS; CONTACTING SAID MICROCRYSTALS AT THE SURFACE OF THE SOLUTION WITH A MOISTENED OXIDIZING ATMOSPHERE, AND THEREBY FORMING A FLOATING LAYER OF PURE FINELY DISPERSED ALUMINUM OXIDE ON TOP OF SAID SOLUTION.
Claim 2
Dependent Claim
129 words
PROCESS FOR PRODUCING PURE DISPERSED AMORPHOUS ALUMINUM OXIDE BY DISSOLVING AT A TEMPERATURE ABOVE 200* C. IN A NON-OXIDIZING ATMOSPHERE A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM AND ALLOYS THEREOF OTHER THAN ALKALINE AND ALKALINE EARTH METAL ALLOYS IN ONE OF THE MATERIALS OF THE GROUP CONSISTING OF MERCURY, ALLOYS OF MERCURY AND GALLIUM TO YIELD A CONCENTRATION OF SUBSTANCE WITHIN THE RANGE OF 0.01 AND 4% BY WEIGHT; SPREADING SAID SOLUTION INTO A THIN LAYER AND COOLING THE SOLUTION TO A TEMPERATURE BELOW 120* C., WHEREBY THE ALUMINUM SEPARATES THEREFROM IN THE FORM OF MICROCRYSTALS; CONTACTING SAID MICROCRYSTALS AT THE SURFACE OF THE SOLUTION WITH A MOISTENED OXIDIZING ATMOSPHERE, AND THEREBY FORMING A FLOATING LAYER OF PURE FINELY DISPERSED ALUMINUM OXIDE ON TOP OF SAID SOLUTION.
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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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |