Patent US3371778A successfully refreshed from Google Patents.
US3371778A
Expired / Lapsed
US
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Method of treating starches for flotation of minerals
Assignee: University of Minnesota Twin Cities
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Filing: 1965-02-12
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Granted: 1968-03-05
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Expires: 1985-02-12
Abstract
No abstract record available.
Inventors
- 👤 Iwasaki Iwao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:43
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D1/008; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2364777A
Cited
US2497863A
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US2555825A
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US3105778A
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US3137592A
Cited
US3175928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |