Patent US2804168A successfully refreshed from Google Patents.
US2804168A
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US
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Apparatus for filtering solids from gas-solids suspensions
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1951-07-26
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Granted: 1957-08-27
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Expires: 1971-07-26
Abstract
No abstract record available.
Inventors
- 👤 Church Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:19
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D46/42; B01D46/4263; B01D46/4281; B01D46/48; B01D46/66; B01D46/70; B01D46/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2154773A
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US2255519A
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US2526651A
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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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |