Patent US2409585A successfully refreshed from Google Patents.
US2409585A
Expired / Lapsed
US
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Supernatant selector device for sludge digestion tanks
Assignee: Pacific Flush Tank Co
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Filing: 1945-07-21
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Granted: 1946-10-15
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Expires: 1965-07-21
Abstract
No abstract record available.
Inventors
- 👤 William M Piatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:50
CPC Classifications
C; C12; C12M; C12M21/00; C12M21/04; C02; C02F; C02F11/00; C02F11/02; C02F11/04; C12M23/00; C12M23/36; Y; Y10; Y10S; Y10S210/00; Y10S210/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-10-14 | 1950-04-15 | 1950-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-10-14 | 1954-04-15 | 1954-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-10-14 | 1958-04-15 | 1958-10-15 | $7700.00 | Window Closed / Lapsed |