Patent US2880871A successfully refreshed from Google Patents.
US2880871A
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Process and device for sifting solid and liquid materials
Assignee: Rhewum GmbH
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Filing: 1954-01-25
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Granted: 1959-04-07
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Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 Bruninghaus Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:33
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/28; B07B1/34; B07B1/346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1179428A
Cited
US1597826A
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US1482607A
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US1864940A
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US1941212A
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US2109395A
Cited
GB444170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |