US3446353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for froth flotation
Assignee: Zinc Corp Pty Ltd
•
Filing: 1966-04-25
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Granted: 1969-05-27
•
Expires: 1986-04-25
Abstract
No abstract record available.
Inventors
- 👤 William John Nankivell Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1412; B03D1/1443; B03D1/1456; B03D1/1493; B03D1/24; B03D1/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1143162A
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US1219089A
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DE328031C
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US1598858A
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US2938629A
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GB965706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |