Patent US2976995A successfully refreshed from Google Patents.
US2976995A
Expired / Lapsed
US
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Magnetic separator operating in an aqueous medium
Assignee: Individual
•
Filing: 1957-01-10
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Granted: 1961-03-28
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Expires: 1977-01-10
Abstract
No abstract record available.
Inventors
- 👤 Forrer Robert Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:03
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US599744A
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US927277A
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US1209560A
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US1720893A
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US1769344A
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US2028694A
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US2062685A
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US2243947A
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US2396877A
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US2541349A
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |