Patent US3702607A successfully refreshed from Google Patents.
US2944802A
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Froth flotation and aeration apparatus
Assignee: Denver Equipment Co
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Filing: 1955-02-16
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Granted: 1960-07-12
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Expires: 1975-02-16
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Daman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:53
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/1406; B03D1/1443; B03D1/1456; B03D1/1475; B03D1/20; B03D1/22; B03D1/24; B03D1/242; B03D1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2238139A
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US2246560A
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US2423456A
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US2612358A
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US2628827A
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US2648529A
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US2743914A
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US2767965A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |