US3459681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Caustic leach treatment of alumina particles to improve strength properties
Assignee: Wyeth Holdings LLC
•
Filing: 1966-02-24
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Granted: 1969-08-05
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Expires: 1986-02-24
Abstract
No abstract record available.
Inventors
- 👤 William Beveridge Innes
- 👤 Malden Ward Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:55
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/503
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2818393A
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US2806004A
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US2971928A
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US2939848A
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US3038865A
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US3280041A
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US3271325A
Cited
US3291564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |