Patent US4236928A successfully refreshed from Google Patents.
Patent US2615575A successfully refreshed from Google Patents.
US2615575A
Expired / Lapsed
US
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Continuous rotary filter
Assignee: Individual
•
Filing: 1946-10-29
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Granted: 1952-10-28
•
Expires: 1966-10-29
Abstract
No abstract record available.
Inventors
- 👤 Wright Anna Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:12
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/044; B01D33/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1368618A
Cited
US1799775A
Cited
US1812812A
Cited
US1892306A
Cited
US2247460A
Cited
US2338777A
Cited
US2348340A
Cited
US2426886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |