Patent US3721626A successfully refreshed from Google Patents.
Patent US1858272A successfully refreshed from Google Patents.
US1858272A
Expired / Lapsed
US
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Treatment of bauxite, clay, and intermediate aluminum bearing ores
Assignee: INTERMETAL Corp
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Filing: 1929-08-09
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Granted: 1932-05-17
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Expires: 1949-08-09
Abstract
No abstract record available.
Inventors
- 👤 Leslie G Jenness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:52
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/56; C01F7/58; C01F7/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-05-17 | 1935-11-16 | 1936-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-17 | 1939-11-16 | 1940-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-17 | 1943-11-16 | 1944-05-17 | $7700.00 | Window Closed / Lapsed |