US2476979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing alumina from clays and other silicates of aluminum
Assignee: Individual
•
Filing: 1945-08-21
•
Granted: 1949-07-26
•
Expires: 1965-08-21
Abstract
No abstract record available.
Inventors
- 👤 Erwin C Hoeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:23
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/68; C01F7/74; C01F7/743; C01F7/02; C01F7/20; C01F7/26
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) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |