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Patent US3464552A successfully refreshed from Google Patents.
US3464552A
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Froth flotation apparatus
Assignee: Research and Development Pty Ltd
•
Filing: 1967-12-18
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Granted: 1969-09-02
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Expires: 1987-12-18
Abstract
No abstract record available.
Inventors
- 👤 Charles Harold Warman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:32
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1493; B03D1/16; B03D1/20; B03D1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1976956A
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US2019325A
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US2198143A
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US2313654A
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US2291031A
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US2308751A
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US3070229A
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US3327851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |