US2467409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sludge control for sedimentation tanks
Assignee: Individual
•
Filing: 1945-04-18
•
Granted: 1949-04-19
•
Expires: 1965-04-18
Abstract
No abstract record available.
Inventors
- 👤 William L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:15
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/10; B01D21/12; B01D21/14; B01D21/003; B01D21/0036; B01D21/18; B01D21/186; B01D21/24; B01D21/2405; B01D21/2416; B01D21/2427; B01D21/245; B01D21/30; B01D21/302; B01D21/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US353775A
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US1071784A
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US1140131A
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US1227107A
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US1478674A
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US1833390A
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US2126884A
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US2141371A
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AU474832B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-18 | 1952-10-18 | 1953-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-18 | 1956-10-18 | 1957-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-18 | 1960-10-18 | 1961-04-19 | $7700.00 | Window Closed / Lapsed |