Patent US2461619A successfully refreshed from Google Patents.
US2461619A
Expired / Lapsed
US
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Auxiliary backwash for watertreating systems
Assignee: Individual
•
Filing: 1945-01-12
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Granted: 1949-02-15
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Expires: 1965-01-12
Abstract
No abstract record available.
Inventors
- 👤 Wolcott Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:54
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4631; B01D24/4636; B01D24/02; B01D24/10; B01D24/12; B01J; B01J49/00; B01J49/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US418186A
Cited
US598383A
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US695399A
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US949455A
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US1762585A
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US2309916A
Cited
US2309917A
Cited
US2364775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |