Patent US2472558A successfully refreshed from Google Patents.
US2472558A
Expired / Lapsed
US
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Rotary drum filter
Assignee: Oliver United Filters Inc
•
Filing: 1945-12-27
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Granted: 1949-06-07
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Expires: 1965-12-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Orville B Ackerly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:29
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; B01D33/073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US748756A
Cited
US2289411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |