US3412858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic classifier having automatic underflow discharge control
Assignee: Deister Concentrator Co Inc
•
Filing: 1965-06-16
•
Granted: 1968-11-26
•
Expires: 1985-06-16
Abstract
No abstract record available.
Inventors
- 👤 Spencer A Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:51
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2120003A
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US2490365A
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US2696298A
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US2749928A
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US2738068A
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US2964179A
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US2954870A
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US3095097A
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US3034649A
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US3249226A
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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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |