Patent US3407934A successfully refreshed from Google Patents.
US3407934A
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Method and apparatus for separating particles from suspensions such as sludge and the like
Assignee: KARL GORAN HENRIK EJEFORS
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Filing: 1966-04-19
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Granted: 1968-10-29
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Expires: 1986-04-19
Abstract
No abstract record available.
Inventors
- 👤 Ejefors Karl-Goran Henrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
C; C02; C02F; C02F11/00; B; B01; B01D; B01D21/00; B01D21/26; B01D21/262
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1873598A
Cited
US2228017A
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US2462098A
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US2754968A
Cited
GB866861A
Cited
US3226317A
Cited
US3200068A
Cited
US3180824A
Cited
US3208701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |