Patent US3402024A successfully refreshed from Google Patents.
US3402024A
Expired / Lapsed
US
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Method of treating alumina
Assignee: United States Department of the Army
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Filing: 1963-11-22
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Granted: 1968-09-17
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Expires: 1983-11-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul A Marshall
- 👤 Paul A Rishel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:50
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5018; C04B41/53; C04B41/5338; C04B41/5346; C04B41/5353; C04B41/80; C04B41/81; C04B41/85; C04B41/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |