Patent US3471285A successfully refreshed from Google Patents.
US3471285A
Expired / Lapsed
US
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Process for the selective recovery of manganese and iron from ores
Assignee: Dow Chemical Co
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Filing: 1967-03-27
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Granted: 1969-10-07
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Expires: 1987-03-27
Abstract
No abstract record available.
Inventors
- 👤 Ramon F Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:07
CPC Classifications
C; C22; C22B; C22B47/00; C22B47/0018; C22B47/0045; C22B47/0054; C22B47/0072; C22B3/00; C22B3/04; C22B3/12; C22B3/14; C22B47/0027; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/04
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) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |